Official Quant thread for CAT 2013

MBA CAT 2024
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@adwaitjw said:
But It is not mentioned normal coin... Wont that affect?
nope.
By default it would be a normal coin.
Check out probability questions. The questioner never mention whether some coin is special, unless it is a special case. We automatically assume that it's a coin with two possible outcomes either head or tail :D
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@vijay_chandola said:
nope.By default it would be a normal coin.Check out probability questions. The questioner never mention whether some coin is special, unless it is a special case. We automatically assume that it's a coin with two possible outcomes either head or tail
But in this question there was a mention of special coin so asked. Neways no prb.. Will assume normal coin nw...
P.S. sorry for spamming...
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@badwal.aman said:
N = 11 × 22 × 36 × 412 × 520 ..... 25 terms. Find the highest power of 75 that can divide N. plz help.. 1. 19502. 13303. 9504. none
The series must be like this
11= 1 x 1
22= 1 x 2
36= 2 x 3
412=3 x 4
520= 4 x 5
630=5 x 6
like this the the 25th term will be 24 x 25=25600

PS : Its a strange series . I am unable to do further anything . @badwal.aman r u sure the series is like this .
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@shattereddream sorry it's 1^1*2^2*3^6*4^12*5^20..upto 25 terms.Find the highest power of 75 that can divide N.
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@rkshtsurana said:
3 ?cant be 24...2 is a fctor of 24..2-1 = 1 is nt prime
True...

24 is for non-composite resultant.
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@badwal.aman said:
@shattereddream sorry it's1^1*2^2*3^6*4^12*5^20..upto 25 terms.Find the highest power of 75 that can divide N.
Total no of 5's = 20 + 90 +210 +380 + 1200 = 1900


Power of 75 in this = 3 x 5^2 = 1900/2 = 950
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@adwaitjw said:
7 coinsIf shared in ratio 1:5:8, 1 coin is left out... Means in other words if we divide the total no by (1+5+8) i.e. 14, 1 is remainderSimilarly in second case, if we divide the total no by (1+3+7) i.e. 11, remainder is 0.Least possible such no is 99.So by first case 1 coin is left out & remaining distributed in ratio 1:5:8. Hence C gets 56.N in second case 99 coins are distributed in ratio 1:3:7. So C gets 63.Diff.=7
Yaa ye remainder vaale method ke alawa solve ho skta hai..
Ye hamesha valid hota hai kya or haan to kaise???
Strike hi ni kiya ye to!!!!!!!!!!!
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@12sahil12 said:
Yaa ye remainder vaale method ke alawa solve ho skta hai..Ye hamesha valid hota hai kya or haan to kaise???Strike hi ni kiya ye to!!!!!!!!!!!
Jahan tak I knw is prb ke liye yehi simplest way hai. ATDH saar ne bhi yehi method se karke bataya hai.
U can check his soln very well explained. \\_O_____//
http://www.pagalguy.com/posts/4247728

For more details go to video link provided by him.
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Solve this


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@vbhvgupta said:
only 1st is sufficient in triangle question
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@vbhvgupta said:
Statement 1 alone is sufficient.
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@vbhvgupta : i think first can be done by both statement ... becoz only 1 case will satisfy it that is a=1 b=1 ... hence ... a*b/a+b = not divisible

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@vbhvgupta : triangle prob = 1 alone ...


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@vbhvgupta said:
combination of two is required in cylinder question
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@vbhvgupta said:
combination of two is required in pen pencil eraser question
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@19rsb said:
combination of two is required in cylinder question
Can u explain?
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@19rsb said:
combination of two is required in pen pencil eraser question
I am not getting the multiplier...I know it can be found by using both