Find the probability that a randomly selected three-digit number has the sum of 18, 21.
| March 12, 2021 | education
The sum of numbers 18, 21 = 39. Probability P = m / n. m – Suitable options. Three-digit numbers with 39 can have a different number in front or behind (139 or 391). There are 9 + 9 such numbers = 18. m – the number of all possible options. Three-digit numbers from 100 to 999. Their number = 999 – 100 + 1 = 900. P = 18/900 = 0.02.
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