Math, asked by sharalsharal65, 8 months ago

find the sum of the series 3+ 9+11+ .......... to 10 times​

Answers

Answered by Prongs1
0

Answer:

By the way this is no series.... as common difference is not same.. I am considering this is a series of odd numbers....(3,5,7,9....)

120

Step-by-step explanation:

Here,

a = 3

d = 5-3 = 2

n = 10

Sum of an ap =

 \frac{n}{2}  \times (2a + (n - 1)d)

 =  \frac{10}{2}  \times (6 + 9(2)) \\  = 5 \times (6 + 18) \\  = 5 \times 24 \\  = 120

Hope it helps....

Any doubts please comment

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