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Question
Sum of the number of primes between 16 to 80 and 90 to 100 is ______.
Options
20
18
17
16
Solution
Sum of the number of primes between 16 to 80 and 90 to 100 is 17.
Explanation:
Prime numbers between 16 to 80 are 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73 and 79. .
So, there are 16 prime numbers between 16 to 80.
Also, 97 is the only prime number between 90 to 100.
So, there is only 1 prime number between 90 to 100.
∴ Required sum = 16 + 1 = 17
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