3. Sum of the number of primes between 16 to 80 and 90 to 100 is
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Between 16 to 80 = (17,19,23,39,31,37,41,43,47,53,59,61,67,71,73,76,79) = there are 17 prime nos. between 16 to 80
Between 90 to 100 = 97 only 1 prime number
Total sum = 17 + 1 = 18
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