Q1 of 69 Page 78

Choose the correct alternative answer for each of the following sub questions.

If for any A.P. d = 5 then t18 – t13 = ...

Given d = 5


Now, By using nth term of an A.P. formula


tn = a + (n – 1)d


where n = no. of terms


a = first term


d = common difference


tn = nth terms


Thus, t18 – t13 = [a + (18 – 1) × 5] – [ a + (13 – 1) × 5]


⇒ t18 – t13 = [ 17 × 5] – [ 12 × 5]


⇒ t18 – t13 = 85 – 60 = 25


Thus, correct answer is (C)

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