Question

a two digit number is formed with the digits 2,5,9 (repetition is allowed). find the probability that the number is divisible by 2 or 5 ​

Answer 1

Answer:

All 2 digit numbers formed with digits 2, 5, 9 (with repetition):-

22, 25, 29, 52, 55, 59, 92, 95, 99

Numbers divisible by 2 = 22, 52, 92 (3 numbers)

Total numbers = 9

Probability = $\frac{3}{9}$

= $\frac{1}{3}$

Numbers divisible by 5 = 25, 55, 95 (3 numbers)

Total numbers = 9

Probability = $\frac{3}{9}$

= $\frac{1}{3}$

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Answer 2

I have attached the hand written solution

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