asd_dah's posts

asd_dah
replied to Official Quant Thread for CAT 2011 [Part 8]

Hi puys solve this im really confused abt this questn plz post detailed soln

There is row of 30 seats & there are 6 groups of 4 persons each. In how many ways can 6 blocks with 4 consecutive seats in each block, be selected to seat all the six groups ??

There is row of 30 seats & there are 6 groups of 4 persons each. In how many ways can 6 blocks with 4 consecutive seats in each block, be selected to seat all the six groups ??

asd_dah
replied to Special Tricks for CAT 2011

For the frst one answr is 6 as given below:-

1>it can be written as 2^2(1^2+11^2+111^3.....& so on till 1111.....49times)

Now a number is divisible by 9 if the sum of its digit is divisible by 9 so we have

2^2(1^2+2^2+3^2.......49^2)

which will be 2^2(49*50*9/6-----(A)

using formu...

1>it can be written as 2^2(1^2+11^2+111^3.....& so on till 1111.....49times)

Now a number is divisible by 9 if the sum of its digit is divisible by 9 so we have

2^2(1^2+2^2+3^2.......49^2)

which will be 2^2(49*50*9/6-----(A)

using formu...

2