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Question

a 5 digit pin code is required which should start with 7 at first digit and 8 as last digit you choose any number from 0 to 9 repetition of number is also allowed find the probability of such code solve

Answer 1

Since the first and last numbers are fixed, each of the middle 3 have 10 possible values, so there are 10*10*10 or 1000 possible combinations, so on any given try there is a 1/1000 or 0.1% chance of success.