Question

2) A two digit number is to be formed with the digits 2, 3, 5, 7, 9 without repetition of the digit​

Answer 1

${\huge{\boxed{\mathcal{\blue{HELLO}}}}}$

Digits are {22,23,25,27,29,32,33,35,37,39,52,53,55,57,59,72,73,75,77,79,92,93,95,97,99}

∴Total digits are 25

Odd numbers are 20

∴ probability that an odd number is formed is =20/25=4/5

Numbers which are multiple of 5 are

{25,35,55,75,95}

∴ probability of multiple of 5 is =5/25

 =  1/5

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