मराठी

A bag contains 19 tickets, numbered from 1 to 19. Two tickets are drawn randomly in succession with replacement. Find the probability that both the tickets drawn are even numbers. - Mathematics

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प्रश्न

A bag contains 19 tickets, numbered from 1 to 19. Two tickets are drawn randomly in succession with replacement. Find the probability that both the tickets drawn are even numbers. 

बेरीज
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उत्तर

Total numbers of tickets n(S) = 19

Even numbers E = {2, 4, 6, 8, 10, 12, 14, 16, 18}

n(E) = 9

Probability of getting even number on first ticket

= `(n(E))/(n(S))`

= `9/19`

∵ Replacement of ticket is allowed.

So probability of getting even number of second ticket drawn = `9/19`

Hence required probability = `9/19 xx 9/19 = 81/361`

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