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BITSAT Mathematics Sequences and Series 2020 BITSAT 2020

BITSAT Mathematics Question (2020) — Solution

Question

A student read common difference of an A. P. as -2 instead of 2 and got the sum of first 5 terms as -5 . Actual sum of first five terms is

Options

  1. A. 25
  2. B. -25
  3. C. -35
  4. D. 35

Answer

D. 35

Step-by-step solution

5 2 \ 2 a +4(-2)\ =-5 2 a =6 Actual sum = 5 2 \ 6+4(2)\ =35

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