MBA Exam

11.How many six-digit numbers comprising of only the digits 6 and 8 are divisible by 3?Im getting 6C3=20 but the given aswer is 22 how it is coming please throw some lights on this topic.

1) 16
2) 18
3) 20
4) 22

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MBA Other Question

In an examination there are 'x' questions. Then number of students who answered 'y' or more questions wrongly where 1<=y<=x is given by 2^(x-y). The total number of wrong answers is 8191. Find 'x'

1) 18
2) 12
3) 11
4) 13
P ={1, 2, 3, 6,12, 24, 48, 96}. How many distinct values of ‘x’ are possible, if ‘x’ is defined as the sum of one or more elements of the set ‘P’?

1) 150
2) 192
3) 148
4) 191