Q17 of 124 Page 1

If 3 is the least prime factor of number a and 7 is the least prime factor of number b, then the least prime factor of a + b, is

The prime factors of a + b


= 3 + 7 = 10 = 2 × 5


So the least prime factor is 2.

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15

If p and q are co-prime numbers, then p2 and q2 are

 16

Which of the following rational numbers have terminating decimal?

(i)16/225 (ii)5/18


(iii)2/21 (iv)7/250

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is

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The smallest number by which should be multiplied so as to get a rational number is