1.

How many terms are there in the AP 10, 15, 20, 25,... 120? (a) 21 (b) 22 (c) 23 (d) 24

Answer»

Correct option (c) 23

Explanation:

In order to count the number of terms in the AP, use the shortcut: 

[(last term − first term)/ common difference] + 1. In this case it would become: 

[(120 − 10)/5] + 1 = 23



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