Question

sum of the numbers of primes between 16 to 80 and 90 to 100
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Answer 1

Hence, Prime numbers between 16 to 80 are,${\bf{\orange{[17, 19, 23, 29, 31, 37, 41, 43, 47,}}} \\ {\bf{\orange{ 53, 59, 61, 67, 71, 73 \: and \: 79]}}}$

∴ There are 16 prime number between 16 to 80......[1]

Hence, Prime numbers between 90 to 100 are, ${\bf{\orange{[97]}}}$

∴ There is only 1 prime number between 90 to 100......[2]

Sum of the primes numbers between 16 to 80 and 90 to 100 is,

$=>16 + 1 = \green{\boxed {17}}............from\:[1]\:and\:[2]$