MBA Exam

among 10 bulbs 4 are defective,if three bulbs are selected and fitted into 3 holders in a room,what is the probability that the room is lighted?

1) 1/30
2) 2/5
3) 3/5
4) 29/30

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MBA Other Question
Find the last two digits of: 15*37*63*51*97*17.

1) 35
2) 45
3) 55
4) 85
 Find the largest two digit prime factor of

1) 97
2) 83
3) 57
4) 79