Numbers - Arithmetic Aptitude Questions and Answers

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2 + 22 + 23 + ... + 29 = ?

2044

1022

1056

None of these

Answer : Option B

Explanation :

This is a G.P. in which a = 2, r= $\frac {2^2 } { 2 }$ = 2 and n = 9.

S_n = $a (\frac {( r^n-1) } { (r-1) } )$ = $2*\frac {( 2^9-1) } {(2-1) }$ = 2 x (512 - 1) = 2 x 511 = 1022.

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