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HACTEHA [7]
3 years ago
7

Can someone help me plz Xd

Mathematics
1 answer:
stira [4]3 years ago
8 0

Answer:

-2497

Step-by-step explanation:

Sn=n/2[2a+(n-1)d]

=22/2[2*-40+(22-1)d]

=11(2*-40+(21*-7)

= -2497

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