Question
Find the product of all prime numbers between 1 and 20.
Answer: Option B
:
B
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B
Going by elimination, option (a) is eliminated because the product of prime numbers 2 and 5 is 2×5=10, which should yield one zero.
As 3 is a factor of the product, check which of the remaining options are a multiple of 3. Only option (b) and option (d) are both factors of 3.
Checking for 7 and 13, sum of triplets at odd places-sum of triplets at even places=0 in option (b). Hence, option (b) is the answer.
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