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Public18 with proof!

\times 3 \times 5 = 30

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The product of the distinct prime factors is \(\boxed{30}\).

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Question: How many positive 2-digit numbers are divisible by 6?

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Solution:

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A number is divisible by 6 if it is divisible by both 2 and 3. The smallest 2-digit number is 10 and the largest is 99.

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First determine the smallest 2-digit number divisible by 6. Starting from 10 the smallest multiple of 6 is 12.

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Next find the largest 2-digit number divisible by 6. From 99 the largest multiple of 6 is 96.

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Now find the sequence of 2-digit numbers divisible by 6: 12 18 24 ... 96. This sequence is an arithmetic series where the first term \(a = 12\) and the common difference \(d = 6\).

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To find the number of terms use the formula for the \(n\)-th term of an arithmetic sequence:

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