MBA Exam

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

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MBA Other Question

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
In an exam, a student is given five possible answers for each question. 4 marks will be given for every correct answer and -1 mark for a wrong answer. If the student guesses and marks, what be will the expected marks for a single question?No excuses

1) 0
2) 1
3) 1/2
4) 1/4