Which is the smallest number, having four different prime factors?

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Solution

Step 1: Find the first four prime numbers.
The first four prime numbers are $2, 3, 5$ and $7$
Step 2: Find smallest number having first four prime numbers.
The smallest number having four different prime numbers will be the product of those numbers.
Product of first four prime numbers $= 2 \times 3 \times 5 \times 7 = 210$
Therefore, $210$ is the smallest number having four different prime numbers.

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