Quantitative Aptitude : Shortcut Methods. Numerical Calculations Tutorial(Sum Of Series)

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Quantitative aptitude shortcut methods. Shortcut methods used in numerical calculations.

Que: Find sum of the series 2 + 2^2 + 2^3 + …… + 2^10

Ans: This is a G.P
Here a = 2 and r = 2^2 / 2 = 2
and required sum = a ( r^n -1 ) / ( r-1 )
= 2 ((2^10) -1 ) / (2-1)
= 2 * 1023 = 2046

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