MBA Exam

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

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MBA Other Question

find the number of integral solution to |x|+|y|+|z| =10Please post ur approach .

1) 402
2) 304
3) 202
4) 502
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