Sum of the number of primes between 16 to 80 and 90 to 100 is (A) 20 (B) 18 (C) 17 (D) 16
Sum of the number of primes between 16 to 80 and 90 to 100 is
(A) 20 (B) 18 (C) 17 (D) 16
4 views
2 Answers
(C) 17
Prime numbers between 16 to 80 = 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73 and 79.
Then, number of primes between 16 to 80 = 16
Prime numbers between 90 to 100 = 97
Then, number of primes between 90 to 100 = 1
Therefore, Sum of the number of primes between 16 to 80 and 90 to 100 is,
= 16 + 1
= 17
4 views
Answered