Question 84

The average of all odd numbers from 113 to 159 is .............

Solution

first term is 113 .

So, next odd terms would be at common difference of 2.

So, $$113+\left(n-1\right)2=159\ .$$

or, $$\left(n-1\right)=\frac{46}{2}=23.$$

or, $$n=24.$$

So, Total of all odd numbers from 113 to 159 = $$\frac{24}{2}\left(113+159\right)=3264.$$

So, Average of them = $$\frac{3264}{24}=136\ .$$

D is correct choice.

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