Math, asked by TristAnnie7915, 1 year ago

S 11 is 105 and S10 is 90 then 15 is ?

Answers

Answered by jinadevkv

1

Answer:

S15 = 180

Step-by-step explanation:

Common difference d = S11 - S10 = 105 - 90 = 15

S15 = S11 + 5d = 105 + 5*15 = 105 + 75 = 180

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