Q19 of 124 Page 1

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

If we multiply we will get a perfect square 9 which is a rational number.

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 smallest rational number by which 1/3 should be multiplied so that its decimal expansion terminates after one place of decimal, is

If n is a natural number, then 9²ⁿ – 4²ⁿ is always divisible by