Assume that the first term of the GP is 'a' and common ratio 'r'.
Consult your textbook/class-notes/Google and find the equation for the SUM of first 'n' terms of a GP ( first term of the GP is 'a' and common ratio 'r' ).
What will be the expression for sum of first 8 terms ?
What will be the expression for sum of first 10 terms ?
steps (3) and (4) will give two equations with 2 unknowns ('a' & 'r')
Solve for 'a' and 'r' using your favorite method.
Please show us what you have tried and exactly where you are stuck.
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