Question

Check whether following numbers are prime or composite
(i) 2 x 3 + 5
(ii) 7 x 11 x 13 + 13
(ii) 3 x 7 + 2
(iv) 13 x 17 x 19 +23 x 38​

Answer 1

Answer:

(1) 2 x 3 = 6

6 + 5 = 11

So, the first answer is 11

(2) 7 x 11 = 77

77 x 13 = 1001

1001 x 13 = 1014

So, the second answer is 1014

(3) 3 x 7 = 21

21 + 2 = 23

So, the third answer is 21

(4) 13 x 17 x 18 = 4199

4199 + 23 + 38 = 4260

So, the fourth answer is 4260

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