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Norma-Jean
[14]
4 years ago
9
Find the s10 for series 2+7+12+17+
Mathematics
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1
answer:
Tomtit
[17]
4 years ago
8
0
Sn=n/2(2a+(n-1)d)
n=10 a=2 d=5
s10=10/2(2*2+(10-1)5)
=5(4+9*5)
=5(4+45)
=5(49)
=245
answer should be 245.
hope this helps!
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