1.

The average of all odd numbers from 113 to 159 is ______.1). 1352). 1343). 1334). 136

Answer»

First we need to FIND the total number of odd NUMBERS,

Last number = 159 and First number = 113

According to AP,

⇒ 159 = 113 + 2(n - 1)

⇒ n - 1 = 23

⇒ n = 24

∴ Sum of 24 odd numbers from 113 to 159 = 24/2 × [2 × 113 + 2(24 - 1)]

⇒ 12 × [226 + 46]

⇒ 3264

AVERAGE = 3264/24 = 136


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