If the HCF of 65 and 117 is expressible in the form 65 m – 117, then the value of m is
(A) 4 (B) 2 (C) 1 (D) 3
Answer. [B]
Solution. First of all, let us find the HCF of 65 and 117
65 = 1 × 5 × 13
117 = 1 × 3 × 13 × 3
HCF = 13 ….(1)
According to question HCF = 65 m – 117
Using (1)
13 = 65 m – 117
13 + 117 = 65 m
m = 2
Therefore, option (b) is correct.