what is the value of 'd' in N=19700019d where N is a prime number

1) 1
2) 3
3) 7
4) 9

• Prime number is odd number, so last digit should be d = 1,3, 7, 9.
  197000191 is a prime number
  197000193 = 3 x 13 x 5051287
  197000197 = 101 x 197 x 9901
  197000199 = 3^2 x 11 x 17 x 117053
• 11 years agoHelpfull: Yes(1) No(0)