Question

a book contains 92pages what is the probability that sum of the digits in the page number is 9​

Answer 1

Number of pages of the book = 92 Which are from 1 to 92 Number of possible outcomes = 92 ∴ Number of pages whose sum of its page is 9 = 10 i.e. 9, 18, 27, 36, 45, 54, 63, 72, 81, 90 P(E) = 10/92 = 5/46

Answer 2

Answer:

Possible outcomes are 1,2,3,......91,92

Total number of outcomes=92

Let E be the event of getting the sum of digits in the page number 9

Events favourable to E are 09,18,27,36,45,54,63,72,81,90

hence p(E) = No. of favourable outcomes to event E/ Total number of outcomes

= 10/92

=5/46

#BAL #answerwithquality