Question

A student reads common difference of an AP as -2 instead of 2 and gets sum of first 5 terms as -5. Find the actual sum of the first five terms.

Answer 1

The answer to your question is in the picture.

Brainelist if it helps.

Thank you.

Answer 2

Answer:

35

Step-by-step explanation:

as given student misread the common difference and get wrong sum.

as we know the formula of sum of n terms

$-5=\frac{5}{2}[2a+(5-1)*(-2)]\\\\-2=2a-8\\\\6=2a\\\\a=3$

from here we find the value of a, from here we use actual value and find the sum. so

$sum=\frac{5}{2}[2*3+(5-1)*(2)]\\\\sum=5[3+4]\\\\sum=35$