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Prime Numbers

Question 25 S...

Question

Question 25
Sum of the number of primes between 16 to 80 and 90 to 100 is

(A) 20
(B) 18
(C) 17
(D) 16

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Solution

Since, prime numbers between 16 to 80 are 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73 and 79.
Total number of prime numbers between 16 to 80=16
Prime numbers between 90 to 100=97
Total number of prime numbers between 90 to 100=1
$∴$ Sum of the numbers of primes between 16 to 80 and 90 to 100=16+1=17

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