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29 March, 19:26

A two-digit random number is chosen. What is the probability that the sum of its digits is 5?

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  1. 29 March, 20:14
    0
    10≤n<100

    So the number of two digit numbers is 99-10+1=90

    The only combinations that sum to 5 are 14, 23, 32, 41, 50 so

    P (sum=5) = 5/90

    P (sum=5) = 1/18
  2. 29 March, 23:16
    0
    There are 90 two digit numbers.

    The numbers that have 5 as the sum of their digits are:

    14,23,32,41,50

    which are 5 numbers out of the possible 90

    Therefore the probabilty is 5/90 or 1/18
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