Q1 of 114 Page 38

Which of the following is a pair of co - primes?

Co - prime numbers are the numbers which have only one common divisor = 1 or their HCF = 1.

Here for option (i) HCF(14,25) = 1.

For option (ii) HCF(18,25) = 1.

For option (iii) HCF(31,93) = 31.

For option (iv) HCF(32,62) = 2.

So answers will be (i) and (ii).

Write a rational number between √3 and 2.

Explain why is a rational number.

If a = (2²× 3³× 5⁴) and b = (2³× 3²× 5) then HCF (a, b) = ?

HCF of (2³× 3²× 5), (2²× 3³× 5²) and (2⁴× 3 × 5³× 7) is