What is the average of the first six (positive) odd number each of which is divisible by 7?

A. 42

B. 43

C. 47

D. 49

Show Answer


Solution(By Apex Team)

According to the question, First six odd numbers which are divisible by ‘7’ 7, 21, 35, 49, 63, 77 difference in each value is 14 $\begin{array}{l}\text{ Sn }=\frac{n}{2}[2a+(n-1)d]\\ \text{ Sn }=\frac{6}{2}[2\times7+(6-1)\times14]\\ \text{ Sn }=3(14+70)\\ \text{ Sn }=252\\ \therefore\text{ Average }=\Large\frac{252}{6}\\ =42\end{array}$

प्रातिक्रिया दे