Question

Sum of the number of primes between 16 to 80 and 90 to 100 is
(A) 20 (B) 18 (C) 17 (D) 16

Answer 1

Hello friend
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Prime numbers between 16-80 and 90-100 are

16-80: 17, 19, 23, 27, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79
There are 16

90-100:97

There's only 1

Total number of primes 16+1=17

#The answer is option c

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Hope it helps!

Answer 2

18(b)
17,19,23,29,31,37,41,43,47,51,53,59,61,67,71,73,79,97