- Determine the number of terms n in each geometric series a(1)= −2, r = 5, S(n) = -62?

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What if at midnight of June 8, 1991, the Earth mysteriously exploded in millions of pieces? Calculate a53 for the sequence (a2)=(-7,-11/2,-4,5/2,-1,…)? What is more poweful hummer or monster truck? What if in the summer of 1991, without warning, an giant asteroid hits the Earth? If no wall give me a solution?