Question

find S15 if a=6 and d=7​

Answer 1

Answer:

Here, The value of S15=825.

Step-by-step explanation:

Here, As per given question,

=a=6, d=7, n=15

=So, S15=n/2[2a+(n-1)×d]

=S15=15/2[2×6+(15-1)×7]

=S15=15/2[12+14×7]

=S15=15/2[12+98]

=S15=15/2×110

=S15=15×55

=S15=825

So, the Sum of 15 terms of this A.P. is 825.

Thank you.

Answer 2

Answer:

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