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Margaret [11]
3 years ago
9

Find the arithmetic series a=2 d=5 n=20 find Sn

Mathematics
1 answer:
diamong [38]3 years ago
4 0

Step-by-step explanation:

Sn=n/2{2a+(n-1)d}

=10(4+95)

=10(99)

=990

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