Correct Answer: Option C

Explanation

a + 3d = 13 .......... (1)
a + 9d = 31 .......... (2)

(2) - (1): 6d = 18

d = 18/6 = 3

From (1), a + 3(3) = 13

a + 9 = 13

a = 13 - 9 = 4

Hence,
T₂₄ = a + 23d
T₂₄ = 4 + 23(3)
T₂₄ = 4 + 69
T₂₄ = 73

There is an explanation video available below.

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