# Q.4 - Mathematics

Sum

Q.4

#### Solution

For an A.P.,

t_15=a+14d

And, t_8=a+7d

Given that,

t_15-t_8=7

⇒ (a+14d)-(a+7d)=7

⇒7d=7

⇒d=1

Thus, the common difference is 1.

Concept: Arithmetic Progression - Finding Sum of Their First ‘N’ Terms.
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