1.

The next term of the A.P(a + 3d),(a + d). (a – d) is ……………..A) a + 2d B) a – 2d C) a – 4d D) a – 3d

Answer»

Correct option is (D) a – 3d

Let \(a_1=a+3d,\)

\(a_2=a+d\;\&\;a_3=a-d\)

\(\therefore d=a_2-a_1\)

\(=(a+d)-(a+3d)=-2d\)

\(a_4=a_3+d\)

\(=(a-d)+(-2d)\)

\(=a-3d\)

Correct option is D) a – 3d



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