Question

For a GP t8=640, r=2 find a

Answer 1

a=5.because the terms of a gp are as follows,a,ar,ar*r,ar*r*r,.....and so on ,so
8th terms means ar to the power 7,and when we divide the 8th term by r to the  power 7 we get the ath term of the series ,sif we divide 640%128 we get a=5,

Answer 2

Answer:

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