English, asked by mostolespj, 1 month ago

From the sequence 9,24,39,...find S18.

Answers

Answered by lekshminanda006

0

Explanation:

first term(f) = 9

common difference(d) = 24-9=15

Sum = n/2(2f+(n-1)d)

S18=18/2(2×9+(18-1)15)

=9(18+17×15)

=9×35×15

=4,725

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