sum of the number of primes between 16 to 80 ,
90 to 100
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prime numbers between 16 and 80 = 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79
No. of prime numbers between 16 and 80 = 16
prime numbers between 90 and 100 = 97
No. of prime numbers between 90 and 100 = 1
Therefore, sum of the number of primes between 16 to 80 and 90 to 100 = 16 + 1
= 17
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