Number of primes between $16$ to $80$ and $90$ and $100$ is

20

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18

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17

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16

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Solution

The correct option is C $17$
Number of primes between $16$ to $80$ $=$ $17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79$
Number of primes between $90$ to $100$ $=$ $1 (97)$
$∴$ Total no of primes= $16 + 1 = 17$

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Similar questions

Question 25
Sum of the number of primes between 16 to 80 and 90 to 100 is

(A) 20
(B) 18
(C) 17
(D) 16

x_{i} f_{i}

15, 17, 17, 20, 15, 18, 16, 25, 16, 15,

16, 18, 20, 28, 30, 27, 18, 18, 20, 25,

16, 16, 20, 28, 15, 18, 20, 20, 20, 25

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