use the formula to evaluate the series 1-2+4+8+...-a10

Question

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Answer 1

Do you mean 1-2+4-8+16-32+64...-a10 ??

S=(a)(rⁿ-1)/(r-1) where a=first term, r=common ratio, n=number of terms

S=(1)(-2⁽¹⁰⁾-1)/(-2-1)

S=(1024-1)/(-3)

S=1023/(-3)

S=-341