Question

15. Which of the following are prime numbers?
(1) 103
(ii) 137
(iii) 161
(v) 217
(vi) 277
(vii) 331
(iv) 179
(viii) 397​

Answer 1

prime numbers are the nos which have only 2 factors , 1 and the no itself.

(I) Prime number

(ii) Prime number

(iii) it has 1,7 and 161 as factors. So it is not a prime.

(v) Similarly even this is not a prime no.

(vi) Prime no

(vii) Prime no

(iv) Prime no

(viii) prime