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What is the smallest composite number that is divisible by 3 5 and 9?
Wiki User
∙ 11y ago
45.
Look at the prime decompositions of all three numbers:
3 = 3
5 = 5
9 = 3 * 3
Then take the "union" of all these compositions, i.e. the minimum number of 3s you need is 2, the minimum number of 5s you need is 1 and for all other primes it is 0. Therefore the smallest number divisible by all numbers is 3*3*5 = 45.
Wiki User
∙ 11y ago
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