Question

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

Answer 1

prime number between 16 to 80 =
17,19,23,29,31,37,41,43,47,53,59,61,67,71,73,79.
prime number between 90 to 100 = 97

sum of all prime numbers between 16 to 80 and 90 to 100 = 17+19+23+29+31+37+41+43+47+53+59+61+67+71+73+79+97 = 847

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Answer 2

Hi ,

 Prime numbers between

16 to 80  

= { 17 , 19,23 , 29 ,31 , 37 ,

37 , 41 , 43 ,   47 , 53 , 59 ,

61 , 67 , 73 , 79 }

 Number of primes

between 16 and   80

= 15

 Prime numbers between

90 to 100

 = { 97 }  

Number of prime between

90 to 100  = 1

 Sum of number of  prime

= 15 + 1

= 16  

I hope this helps you.  

: )