First slide

Series

Question

Find the sum of the given series for 20 terms:
5+10+15+20+…….

Moderate

A

950
B

850
C

1050
D

1150

Solution

The sum of the above series is given by $\frac{n}{2} [2 a + (n - 1) d] = 10 [2 \times 5 + 19 \times 5] = 10 {105} = 1050$

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