# How many te

Given: G.P. 3, 32, 33, … and Sum = 120

Here a = 3 and r = = 3

The Sum of terms in G.P. is given by:

= 120

= 120

= 120(2)

= 240

= = 80

3n = 80 +1 = 81

3n = 81

Applying ln on both sides, we get

n = 4

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