find the sum of the following series to n terms: (i) 3+5+9+15+23_ _ _

3 + 5 + 9 + 15 + 23 + .....

The sequence of the differences between the successive terms is 2, 4, 6, 8, ....., which is an A.P.

Subtracting (2) from (1),

  • 23
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