Question

a number is selected at random from a two digit number. The probability of selecting a prime number is ​

Answer 1

Answer:

The primes that are less than 50 are: 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43 and 47. There are 15 primes less than or equal to 50. Thus the probability that a prime is selected at random is 15/50 = 30%.

Answer 2

HEY MATE!!

There are 90 two-digit numbers, from 10 to 99.

There are 90 two-digit numbers, from 10 to 99.Examine each in turn, and count the number of primes. Subtract the number of primes you have just counted from 90, and divide the result by 90.

There are 90 two-digit numbers, from 10 to 99.Examine each in turn, and count the number of primes. Subtract the number of primes you have just counted from 90, and divide the result by 90.You now have the probability of a two-digit number not being a prime.

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