Question

Which of the following is coprime? a)13 and 14 b) 8 and 20 c) 31 and 59 d) 34 and 85​

Answer 1

Answer:

a and c is a co-prime because it HCF is 1.

Stepwise:

14=13×1+1

13=1×13+0

HCF is 1.so it is coprime.

b.20=8×2+4

8=4×2+0

HCF is 4 so, it is not coprime.

c.59=31×1+28

31=28×1+3

28=3×7+1

3=1×3+0

HCF is 1 so,it is a coprime.

d.85=34×2+17

34=17×2+0

hcf is 17 so it is not a co prime.

Answer 2

Answer:

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14 and 13