Question

Two digit are to be select at random the from the digits 1 to 9, if 2 is one of the digits selected,what is the probability that the sum is odd

Answer 1

Answer:

Total digits = 9

Selected digit = 2

Digits left = 8

For sum to be odd:-

2 + x = odd number

To make an even number odd, we add it with an odd number.

Odd numbers between 1 and 9 = 4

Numbers left = 8

$Probability = \frac{4}{8} \\= \frac{1}{2}$

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