Question

Find the number of ordered pairs
(m, n) of positive integers m and n
such that m + n = 190 and m and n
are relatively prime.​

Answer 1

the possible answers are :

(89, 101)

(83, 107)

(11, 179)

(17, 173)

(23, 167)

(41, 149)

(59, 131)

(53, 137)