sum the Series 15 + 19 + 23 .....+ 91
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2
Step-by-step explanation:
hope it will help you .......m
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Answered by
1
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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