Question

Sum of the number of primes between 16 to 80 and 90 to 100 is
(A) 20 (B) 18 (C) 17 (D) 16

Answer 1

Hi ,

Prime numbers between 16 and 80 are

17 , 19 , 23 ,29 , 31 , 37 , 41 , 43 , 47 , 53 ,

59 , 61 , 67 , 71 , 73 , 79 ,

Number of primes between 16 and 80 = 16

Prime number between 90 and 100 is 97

Number of prime between 90 and 100 = 1

Therefore ,

Sum of the number of prime between 16 to 80

and 90 to 100 = 16 + 1 = 17

Option ( C ) is correct .

I hope this helps you.

:)

Answer 2

Answer:

Step-by-step explanation:

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

So, the option c) 17 is correct .

Hope it's helpful !