find
Asked by
| 3rd Oct, 2008,
07:45: PM
Expert Answer:
20+2+22 +......+2r
This is a GP with a = a and r = 2
Sn = a (rn -1 ) / r - 1
= 1 ( 2n - 1) / 2-1 = ( 2n - 1)
Answered by
| 11th Oct, 2008,
09:54: PM
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