Geometri progression

Subhotosh Khan

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Anyone can help me how to find the 1st term?
Possible steps to solve this problem:

  1. Assume that the first term of the GP is 'a' and common ratio 'r'.

  2. 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' ).

  3. What will be the expression for sum of first 8 terms ?

  4. What will be the expression for sum of first 10 terms ?

  5. steps (3) and (4) will give two equations with 2 unknowns ('a' & 'r')

  6. 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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