Question

sum the Series 15 + 19 + 23 .....+ 91​

Answer 1

Step-by-step explanation:

hope it will help you .......m

Answer 2

Answer:

1060

Step-by-step explanation:

an=a+(n-1)d

91=15+(n-1)4

91=15+4n-4

n=20

Sn=n/2{a+an}

=20/2(15+91)

=10(106)

=1060

hope it helped u.

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