Prakash wrote three exams - 1st paper, 2nd paper and 3rd paper. The probability that he passes the 1st paper is 3/5. If he passes in any paper, the probability that he passes the next paper is 7/10. Otherwise the probability is 9/10. What is the probability that he passes in all three papers?

Prakash wrote three exams - 1^st paper, 2^nd paper and 3^rd paper. The probability that he passes the 1^st paper is 3/5. If he passes in any paper, the probability that he passes the next paper is 7/10. Otherwise the probability is 9/10. What is the probability that he passes in all three papers?
1). 0.234
2). 0.284
3). 0.294 
4). 0.264

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