If a= 2n + 13, b= n+ 7 where n is a natural number then hcf of a and b isA) 2. B) 1. C) 4. D) 3

If a= 2n + 13, b= n+ 7 where n is a natural number then hcf of a and b

1.	If a= 2n + 13, b= n+ 7 where n is a natural number then hcf of a and b isA) 2. B) 1. C) 4. D) 3
Answer» Taking different values of n, we find that A and B are co-prime.When {tex}n = 1, A =1 5, B = 8{/tex}When {tex}n = 2, A = 17, B = 9{/tex}When {tex}n = 3, A = 19, B = 10{/tex} and so on....Therefore, {tex}HCF = 1{/tex}