@ishu1991 said:14 people need to be split into 7 pairs. This can be done in 14C2*12C2*10C2*....2C2/7! waysHere we divide by 7! to weed out the repetitions in the pairs
@ishu1991 said:There are 6 students, and you want to form 3 groups of 2 each. How many groups are possible?
6!/2! * 2! * 2! * 3!..?
@The_Loser said:How many ways are there to split 14 people into seven pairs
The first 2 can be selected in 14C2 ways, the next 2 in 12C2 and so on.
So 14C2.12C2.10C2...2C2
And each pair can be rearranged in 2 ways. so multiply the above with 2^7
So 14C2.12C2.10C2...2C2
And each pair can be rearranged in 2 ways. so multiply the above with 2^7
@ishu1991 said:There are 6 students, and you want to form 3 groups of 2 each. How many groups are possible?
6c2*4c2??
@The_Loser said:abhi bhi kuch loch hai. ye 2^7 ku liya aapne?it's simple divide the pairs. nt d arrangement
arrey yar 
@ishu1991 said:There are 6 students, and you want to form 3 groups of 2 each. How many groups are possible?
6c2*4c2
@catahead said:The first 2 can be selected in 14C2 ways, the next 2 in 12C2 and so on.So 14C2.12C2.10C2...2C2And each pair can be rearranged in 2 ways. so multiply the above with 2^7
why arrangments here?
All the page numbers of a book has been added and sum was found to be 1000. But teacher told that one page number has been mistakenly added 3 times. Can you identify the mistakenly added page number?
a. 5 b. 10 c. 27 d. cannot be determined
a. 5 b. 10 c. 27 d. cannot be determined
@bs0409 said:@pirateiim478 Do you know what happened to guys like Varun tyagi,jain4444,Vikrambatra,Jaikishann,Culdip,Vikasneur..........
Varun tyagi wrote GMAT and he got 740 i guess. Dont know where he is!! Vikasneur is in IIMK and he has joined last year itself. I mesg Jain4444 and there is no reply from him. Dont know abt others.
@shattereddream said:All the page numbers of a book has been added and sum was found to be 1000. But teacher told that one page number has been mistakenly added 3 times. Can you identify the mistakenly added page number?a. 5 b. 10 c. 27 d. cannot be determined
5...total pages 44......sum of page nos is 990 but it comes to be 1000...a difference of 10=2 times 5
@shattereddream said:All the page numbers of a book has been added and sum was found to be 1000. But teacher told that one page number has been mistakenly added 3 times. Can you identify the mistakenly added page number?a. 5 b. 10 c. 27 d. cannot be determined
CBD
43 pages => x= 27, 44 pages ==> x=5 so its CBD
43 pages => x= 27, 44 pages ==> x=5 so its CBD
@shattereddream said:All the page numbers of a book has been added and sum was found to be 1000. But teacher told that one page number has been mistakenly added 3 times. Can you identify the mistakenly added page number?a. 5 b. 10 c. 27 d. cannot be determined
5?
44*45/2=990
no. of pages = 44
5 added 2 times
@ravi.theja
@Zedai said:what is the concept involved here man ??@gs4890how is it the lcm of 100 n 120?? tried binominal too.. but cudnt derive it..
@ravi.theja said:1)N=204*221*238*255*...*850...How many zeroes will be there at the end of this number.?sol :- take 17 as common .. 17 ^ 38 * [ 12 * 13 *........50 ] = 17 ^ 38 * 50!/11! ...50! will hav 12 zeros and 11! will hav 2 zeros..so...total 12-2 = 10.p.s :- for any value series with equal difference can do this way
how can we say that 50! have 12 zeroes
@shattereddream said:All the page numbers of a book has been added and sum was found to be 1000. But teacher told that one page number has been mistakenly added 3 times. Can you identify the mistakenly added page number?a. 5 b. 10 c. 27 d. cannot be determined
a?
1) what is the when 3^450 is divided by 108 ?
2) P is a natural number.2P has 28 divisors and 3P has 30 divisors.how many divisors of 6P are there?