Question

Calcule a soma dos 150 primeiros termos da PA (-1,0...)
2

Answer 1

An=A1+(N-1).R
A150=-1+(150-1).1
A150=118

Sn=(A1+An).N
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2

Sn=(-1+118).150
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2

Sn=(117).150
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2

Sn=17550
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2

Sn=8775