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What is sum of the product of the 1st & 5th prime numbers and the 3rd & 9th prime numbers?
Question

What is sum of the product of the 1st & 5th prime numbers and the 3rd & 9th prime numbers?

A.

212

B.

101

C.

118

D.

137

Correct option is D

Given:

First prime number = 2

Third prime number = 5

Fifth prime number = 11

Ninth prime number = 23

Solution:

First 10 prime number are 2, 3, 5, 7, 11, 13, 17, 19, 23,29

Product of 1st and 5th prime number is = 2×11 2\times11 =22

Product of 3rd  and 9th prime number is = 5×235\times23 = 115

Sum of these product = 22 + 115 = 137

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