Question

If the sum of first and 50th term of an arithmetic sequence is 163 then the sum of first 50 terms of the sequence is :

• A. 8510
• B. 4075
• C. 4705
• D. 8150

Answer 1

Answer:

B. 4075

$a+a_{50}=163$

$S_n=\frac{n}{2}(a+a_n)$

$S_{50}=\frac{50}{2}(a+a_{50})$

$=25\times 163$

$=4075$