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Question

The probability of choosing an odd number and then a 20 is .

Answer 1

When 2 events must occur you multiply their individual probabilities. I will assume there is no replacement

We start with 7 numbers 3 of which are odd so Prob of odd is 3/7. Now there are only 6 numbers left one of which is 20 so Prob of 20 = 1/6

The combined probability of both events is then 3/7 x 1/20 = 3/140