CBSE BOARD X, asked by geethika3556, 1 year ago

Find the sum [5+13+21+......181]

Answers

Answered by drushasangwan

8

Here's your answer in the pic

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Answered by achuaiswarya112

8

181=5+(n-1)*8

181-5=(n-1)*8

176/8=n-1

N=23

S23=23/2(5+181)

=23/2*186

=93*23

=2139

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