In an arithmetic progression the first term is 7 and its common difference is 2 If the general term ...........

Quantitative Aptitude ( CCS) Arithmetic progression

In an arithmetic progression the first term is 7 and its common difference is 2. If the general term is (a_n) , find a_7 - a_3.

Given a = 7 and common difference = 2.
General Term a_n = a +(n-1)d a_n
= 7 + 2(n-1) = 2n + 5 a_7
= 14 + 5=19 a_3
= 6 + 5 = 11 a_7 - a_3 = 8

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