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In an AP, $a_{7} - a_{3} = 20$ . What is the common difference?

Class 10Properties and Selection of AP TermsAlgebra — Sequences

A10
B $\frac{20}{7}$
C4
D5

Step-by-Step Solution

a_{7} - a_{3} = (7 - 3) d = 4 d = 20

, so

d = 5

. Dividing by 7 confuses the term number with the gap between terms.

Answer: D) 5

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