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How many factors does 210 have ?...

How many factors does 210 have ?

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` :.` We can choose at least one 2,3,5,7 to be a factor of 210.
`:."The number of factors. = ""^4C_1+ ""^4C_2 + ""^4C_3+ ""^4C_4= 2^2-1=15`(Including 215 itself and excluding 1).
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