Discussion

Explanation:

fog = f(2x + 3) = a(2x + 3) + 1 = 2ax + 3a + 1

gof = g(ax + 1) = 2(ax + 1) + 3 = 2ax + 5

⇒ 2ax + 3a + 1 = 2ax + 5

⇒ a = 4/3

Hence, option (a).

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