@Buck.up said:Plz isse elaborate kar do
no two houses are adjacent.. leave three houses,now between the rest 7 houses, total gap is 8 .
selecting 3 from this can be done in 8C3 ways
selecting 3 from this can be done in 8C3 ways
@DarkHorse25 said:but i got 22
Could be, orally karne mein galti hua hoga mera...entirely possible :)
regards
scrabbler
regards
scrabbler
@scrabbler said:Very elegant and clear explanation, my explanation would involve a great deal more hand-waving and equation-mongering regardsscrabbler
hahahah....i remember i did that in an interview when i asked "what is your fav subject" i replied "math" and uske baad it was a colossal fiasco.....pata nahi usko laga meine math bola toh mein Aryabhatt hun 
ok, no spamming
q) what is the highest power of 12 that divides (5^36 - 1)
1,2,3,4
@REVEALED said:@meow14A)The integer sequence x1,x2,x3.....is such that x(n+2)=x(n+1)-x(n) for n>=1. Sum of first 1492 terms is 1985 and of frst 1985 terms is 1492. Find sum of first 2007 terms.1)3477 2)986 3)493 4)1491 5)573B)Find no. of terms common in series:S1=1,3,6,9,10,15.......200 termsS2=3,6,9,12,15..........200 terms1)21 2)22 3)132 4)133 5)None of theseA) a b b-a -a -b -b+a a bterms repeating after every 6so sum of every 6 terms is zero..now can be solved further...
B) 3*200=600 In s1 consider the series up to 33*34/2=561. hence 22 terms.
So I really suck at quants & this is no exaggeration.Incase it doesn't disturbs you guys' preparation on this thread..any pointers as to where should I begin for CAT-2013?I am planning to get hold of school NCERT books to clear my concepts.What say?
@Mr.White said:So I really suck at quants & this is no exaggeration.Incase it doesn't disturbs you guys' preparation on this thread..any pointers as to where should I begin for CAT-2013?I am planning to get hold of school NCERT books to clear my concepts.What say?
Though starting with NCERT is the best option, but it is almost the end of march....whatever u plan on doing, do it abhi se hi..
rest, kindly post your preparation, strategy (non-quant) queries here: http://www.pagalguy.com/forums/cat-and-related-bschools/official-cat-2013-aspirants-t-88203/p-3610422?page=1
@DarkHorse25 said:B) 3*200=600 In s1 consider the series up to 33*34/2=561. hence 22 terms.
Right maine summation 34 ki jagah 35 liya...my bad. 
regards
scrabbler
regards
scrabbler
@DarkHorse25 how did you get to 561...it seems difficult to ascertain what value would break up tp give n(n+1)/2...
@meow14 said:@DarkHorse25how did you get to 561...it seems difficult to ascertain what value would break up tp give n(n+1)/2...
Not really...if n(n+1)/2 should be around 600, n(n+1) should be around 1200...so n should be close to root(1200)...
Now if you know 35^2 = 1225 then....34*35 will be just less than 1200 and so 34*35/2 just below 600...think about it!
regards
scrabbler
Now if you know 35^2 = 1225 then....34*35 will be just less than 1200 and so 34*35/2 just below 600...think about it!
regards
scrabbler
@Logrhythm said:hahahah....i remember i did that in an interview when i asked "what is your fav subject" i replied "math" and uske baad it was a colossal fiasco.....pata nahi usko laga meine math bola toh mein Aryabhatt hun ok, no spammingq) what is the highest power of 12 that divides (5^36 - 1) 1,2,3,4
2?
@meow14 Approximation bhai. you know 30*15 is 450. So 30*31/2 is greater than 450. Add 90 to it - you will get close to 540, now it will be 33*34/2. You will get the desired ans. Try approximating a few values from now on.
@meow14 said:@DarkHorse25how did you get to 561...it seems difficult to ascertain what value would break up tp give n(n+1)/2...
I didn't break up to give n(n+1)/2 . rather i considered the max limit,. In s2 max value is 600. then 33* 34/2 =561 In s1 , 33 terms is to be considered. Among these 33 terms only 22 are divisible by 3 , hence common between two series .
@scrabbler said:Not really...if n(n+1)/2 should be around 600, n(n+1) should be around 1200...so n should be close to root(1200)...Now if you know 35^2 = 1225 then....34*35 will be just less than 1200 and so 34*35/2 just below 600...think about it!regardsscrabbler
yes 34*35/2 =595 jst below 600. but not divisible by 3. u have to consider the numbers that are divisible by 3. so ur ans is wrong.
@Tusharrr said:As x ranges over all real values, what is the maximum value of root [ (x^2−44x+288) × (−x2+100x−2304) ]?
graph has roots at 8,36,64
domain is 8,64
maximum occurs at x=22 and x=50
value = _/(14^3*42) = 196_/3
@Logrhythm said:hahahah....i remember i did that in an interview when i asked "what is your fav subject" i replied "math" and uske baad it was a colossal fiasco.....pata nahi usko laga meine math bola toh mein Aryabhatt hun ok, no spammingq) what is the highest power of 12 that divides (5^36 - 1) 1,2,3,4
2?
@DarkHorse25 said:yes 34*35/2 =595 jst below 600. but not divisible by 3. u have to consider the number that are divisible by 3. so ur ans is wrong.
Haan I know....I counted 35 also, orally karte karte.... Already edited my post! Was just explaining how to find the closest number whose summation is 600...
regards
scrabbler
regards
scrabbler
@abhishek.2011 said:graph has roots at 8,36,64domain is 8,64maximum occurs at x=22 and x=50value = _/(14^3*42) = 196_/3
Not necessary! not symmetrically in between....4th order....
regards
scrabbler
regards
scrabbler
@scrabbler said:Not necessary! not symmetrically in between....4th order....regardsscrabbler
no actuually u can see that difference between 36-8 and 64-36 is same as graph of this function is nothing but between 8 and 64 it must be symetrical between the two.
had the difference between the roots not be same nothing could be said but here it must be symetrical