How many terms are there in the arithmetic progression: 5, 9, 13, …, 81?

Topic: Number System
Subtopic: Arithmetic Progression

A19

B20

C21

D22

Explanation

a = 5, d = 4, nth term T_n = 81. T_n = a + (n – 1)d => 81 = 5 + (n – 1)4 => 76 = 4(n – 1) => n – 1 = 19 => n = 20.

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