The LCM of 3 and 5 is:

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Solution

The correct option is B 15
Factors of 3: 1, 3
Factors of 5: 1, 5

3 and 5 are co-prime numbers because 1 is their only common factor.
LCM of co-prime numbers is equal to the product of the numbers.

So,
$LCM of 3 , 5 = 3 \times 5 = 15$

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