Discussion :: Numbers
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2 + 22 + 23 + ... + 29 = ?
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Answer : Option B
Explanation :
This is a G.P. in which a = 2, r= \(\frac {2^2 } { 2 } \)= 2 and n = 9.
Sn =\( a (\frac {( r^n-1) } { (r-1) } )\)=\(2*\frac {( 2^9-1) } {(2-1) }\)= 2 x (512 - 1) = 2 x 511 = 1022.
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