MBA Exam

The probability that a bomb may explode is 0.5.2 explosions are needed to destroy a bridge.minimum how many bombs are required that the probability that the bridge is destroyed is more than 90 %.I don't know the answer. But i'am stuck with this. I've marked the answer mentioned by my friend as right, but the answer i am getting is 2 less than that.

1) 9
2) 7
3) 10
4) 8
5) 11

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MBA Other Question
What are the number of ways, when ten persons, amongst whom A, B and C are to speak at a function, where A wants to speak before B and B wants to speak before C?

1) (factorial 10)/6
2) factorial 3 * factorial 7
3) 10P3 * factorial 7
4) (factorial 10)/3
 S can at max 1st 1000 natural no'swhat is the no. of element in S if -1.no no. is prime2. any two no's selected are coprimes

1) 11
2) 12
3) 13
4) 14