Numbers - Arithmetic Aptitude Questions and Answers

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(51+ 52 + 53 + ... + 100) = ?

2525

2975

3225

3775

Answer : Option D

Explanation :

This is an A.P. in which a = 51, l = 100 and n = 50.

Sum = $\frac { n} { 2 }(a+1)$ = $\frac {50 } { 2 }$ x (51 + 100) = (25 x 151) = 3775

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