# Evaluate the foll

The given expression can also be written as …(1) Now this term is in GP.

2, 4, 8…to n terms

Common Ratio = Sum of GP for n terms = …(2)

a = 2, r = 2, n = n

Substituting the above values in (2) we get, 2n + 1 – 2. Now this term is in GP.

1, 3, 9…to n terms

Common Ratio = r = Sum of GP for n terms = …(2)

a = 1, r = 3, n = n

Substituting the above values in (2) we get,  Now, Adding both these we will get the required solution.

2n + 1 – 2 +  Rate this question :

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