Quantitative Aptitude Ques 809

Question: The sum of all even numbers between 21 and 51 is

Options:

A) 518

B) 560

C) 540

D) 546

Show Answer

Answer:

Correct Answer: C

Solution:

  • Required sum $ =22+24+26+…+50 $ Number of terms =15 terms $ S _{n}=\frac{n}{2}[2a+(n-1)d] $ $ =\frac{15}{2}[2\times 22+(14)\times 2] $ $ =\frac{15}{2}[44\times 28]=\frac{15}{2}\times 72=540 $
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