Book Maths Puzzle

find the general term of the GP with the third term 1 and the seventh term 8.

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Book Other Question

a sum of money kept in bank amounts to Rs 1240 in 4 yrs and Rs 1600 in 10 yrs at SI. Find the sum the sum of first two term of an infinite gp is 18. Also, each term of the series is seven times that follow. Find the first term and the common ratio of the series respectively.