Question

-2,-5,-8...........find a20​

Answer 1

Answer:

we don't know your answer..........

Answer 2

Step-by-step explanation:

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

S20=20/2(2(-2)+(20-1)-3)

S20=10(-4-57)

S20=10(-67)

S20=-670

Hope you understand it:):)

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