@dream_IIMA said:@vbhvgupta plz elaborate last line replacing d digit m nt gettng plz
u have to convert the respective term value.
@Logrhythm said:I dont know if i got the question right but is it none? first 100 numbers has 25 primes hence he wld get 75 numbers till then...we need to count 25 numbers more...101,103,107,109 are prime...means 80 numbers till 110111 (multiple of 3), 112 (2k form), 114,115,116,117,118,119,120,121,122,123,124,125,126,128,129,130,132,133 hence 133 is the 100th number....
check this #18276
@vbhvgupta said:u have to convert the respective term value.
bhai yeh question kya hai?? muje toh question hi nahi samaj aya i guess...
@Logrhythm said:bhai yeh question kya hai?? muje toh question hi nahi samaj aya i guess...
bhai upar valaa post dekh lo...
@dream_IIMA said:@vbhvgupta nd @Logrhythm u completed no. system ??
p.S jo bi number system complete kar lega contact me...
@dream_IIMA said:@vbhvgupta nd @Logrhythm u completed no. system ??
bhai...this is not my first time with CAT. i hvnt actually started with my prep....i just try and come here once in a while so that i can at least solve some ques...
will start preps from march...
@dream_IIMA said:@DeAdLy i m starter for cat 13 start with no sytm wt abt u?
M also a veteran...abhi prep ka mann nai hai so just kuch question tum log ke saath solve kar leta hun...
par always happy to help . 
@vbhvgupta m starter nd wid in 2-3 days complt wid no systm
so lets strt geo wt u say
@DeAdLy @Logrhythm to all
consider the set S={2,3,4,.....2n+1} ,where n is a positive integer larger than 2007 .Define X as the average of odd integers in S and Y as the average of the even integers in S.. What is the value of X-Y ???
1
(1/2)n
2008
0
@pavimai said:consider the set S={2,3,4,.....2n+1} ,where n is a positive integer larger than 2007 .Define X as the average of odd integers in S and Y as the average of the even integers in S.. What is the value of X-Y ???1(1/2)n20080
is it 1???
@pavimai said:consider the set S={2,3,4,.....2n+1} ,where n is a positive integer larger than 2007 .Define X as the average of odd integers in S and Y as the average of the even integers in S.. What is the value of X-Y ???1(1/2)n20080
1
Even if the question says that n is greater than 2007 , it does not mean that you have to check it for n greater than 2007. you can take any n
for eg s = (2,3) x-y =1
s= (2,3,4,5) x-y =1
the face in consideration should be that the last number of the set S should be an odd number...
@pavimai said:consider the set S={2,3,4,.....2n+1} ,where n is a positive integer larger than 2007 .Define X as the average of odd integers in S and Y as the average of the even integers in S.. What is the value of X-Y ???1(1/2)n20080
for every number n, there would be a (n+1) present in the set...hence the avg wld be 1 for any n....
@pavimai said:consider the set S={2,3,4,.....2n+1} ,where n is a positive integer larger than 2007 .Define X as the average of odd integers in S and Y as the average of the even integers in S.. What is the value of X-Y ???1(1/2)n20080
take smaller cases
if 2 and 3 then x = 3 and y = 2
x - y =1 =>
if 2 3 4 5
x = 3 y = 4
x-y = 1
if 2 3 4 5 6 7
x = 4 y= 5 x-y =1
if 2 3 4 5 6 7 8 9
x = 5 y = 6 so x-y = 1
so answer has to be 1 :D
if 2 and 3 then x = 3 and y = 2
x - y =1 =>
if 2 3 4 5
x = 3 y = 4
x-y = 1
if 2 3 4 5 6 7
x = 4 y= 5 x-y =1
if 2 3 4 5 6 7 8 9
x = 5 y = 6 so x-y = 1
so answer has to be 1 :D