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Maths Puzzle
Numerical Ability
Number System
Which of the following is prime number?
a)31
b)61
c)71
d)91
Read Solution (Total 5)
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- 31,61,71 are all prime numbers..
91 is not a prime number becoz 13*7 = 91.. - 10 years agoHelpfull: Yes(1) No(0)
- a,b,c are prime no
- 10 years agoHelpfull: Yes(0) No(0)
- 31,61,71 are prime number
- 10 years agoHelpfull: Yes(0) No(0)
- 91 is the only which is not a prime number
- 10 years agoHelpfull: Yes(0) No(0)
- a,b,c are prime no
- 10 years agoHelpfull: Yes(0) No(0)
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