Official Quant thread for CAT 2013

grkkrg · January 18, 2013, 8:51am

@Amrofa said:
Ten families, each comprising 4 members attend a church for Christmas celebrations. If each person exchanges a greeting card with every other person of a different family exactly once, then find the number of greeting cards exchanged.

10C2 * 4^2 * 2! = 45 * 16 * 2 = 1440 (EDIT)

rhinorocks · January 18, 2013, 8:52am

@Amrofa said:
Ten families, each comprising 4 members attend a church for Christmas celebrations. If each person exchanges a greeting card with every other person of a different family exactly once, then find the number of greeting cards exchanged.

1440...?

rhinorocks · January 18, 2013, 8:53am

@grkkrg said:
10C2 * 4^2 = 45 * 16 = 720

bhai...720 ways mein diya ja sakta hai..
receive bhi to kiya ja sakta hai naa...so 720*2 hoga i guess...

ishu1991 · January 18, 2013, 8:53am

@Amrofa
720

ishu1991 · January 18, 2013, 8:54am

@rhinorocks
to count to dono m eiin se ek hi hga kyunki shake hand to exactly nce krna hain na

grkkrg · January 18, 2013, 8:55am

@rhinorocks said:
bhai...720 ways mein diya ja sakta hai..receive bhi to kiya ja sakta hai naa...so 720*2 hoga i guess...

greeting card lo aur wohi return karo.. ban gaya 720

rhinorocks · January 18, 2013, 8:57am

@ishu1991 said:
@rhinorocksto count to dono m eiin se ek hi hga kyunki shake hand to exactly nce krna hain na

nahin naa...shake hands walla concept mat lagao..
yahan exhange aa raha hai...aaj dusron ko letter de rahe hain and dusre se letter le rahe hain..dono is a different thing..

ishu1991 · January 18, 2013, 8:57am

@rhinorocks
han yar got it thnks

rhinorocks · January 18, 2013, 8:58am

@grkkrg said:
greeting card lo aur wohi return karo.. ban gaya 720

bhai...tab 40 se hi nahin ho jayega...

anuragu79 · January 18, 2013, 8:58am

@Amrofa

1440??

zedai · January 18, 2013, 8:59am

@Amrofa said:
Ten families, each comprising 4 members attend a church for Christmas celebrations. If each person exchanges a greeting card with every other person of a different family exactly once, then find the number of greeting cards exchanged.

10c2*4*4*2=1440

sunnychopra89 · January 18, 2013, 9:03am

@pyashraj Right hai boss...:)

nagpal9 · January 18, 2013, 9:07am

what is the next no in the series 3,12,24,33,66,?

sbharadwaj · January 18, 2013, 9:10am

@nagpal9 said:
what is the next no in the series 3,12,24,33,66,?

75.??

audiq7 · January 18, 2013, 9:10am

@nagpal9 said:
what is the next no in the series 3,12,24,33,66,?

75?

ishu1991 · January 18, 2013, 9:14am

@nagpal9
75

anuragu79 · January 18, 2013, 9:15am

@nagpal9

Add 3 and multiply by 2..Ans:75?

sunnychopra89 · January 18, 2013, 9:16am

A number has exactly 15 composite factors. What can be the minimum and maximum number of prime factors of this number?

tootahuadil · January 18, 2013, 9:18am

@anuragu79 said:
Add 3 and multiply by 2..Ans:75?

please explain your approach

anuragu79 · January 18, 2013, 9:19am

@sunnychopra89

min-1 max-4?