MBA Exam

A box contain 20 bulbs.the probability that the box contains exactly 2 defective bulbs is 0.4 and the probability that the box contains exactly 3 defective bulbs is 0.6. bulbs drawn at random one by one without replacement and tested till the defective bulbs are found.what is the probability that the testing procedure ends at 12th testing?

1) 0
2) 1
3) cbd
4) not

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MBA Other Question
Find the smallest positive integer that can be expressed as the sum of 9 consecutive positive integers, sum of 10 consecutive positive integers and sum of 11 consecutive positive integers.

1) 296
2) 324
3) 495
4) 675
 What are the last 2 digits of the expression

1) 56
2) 48
3) 38
4) 68