Question

2x+1,4x-1,5x+1 ... are arithemetic sequence find 9th term

Answer 1

Answer:

Solution

Correct option is

A

2

Given 2x+1,4x,13−x are in A.P.

∴a=2x+1

1) d=a

2

−a

1

∴d=4x−(2x+1)

∴d=4x−2x−1

∴d=2x−1 (1)

2) d=a

3

−a

2

∴d=13−x−4x

∴d=13−5x (2)

From (1) and (2),

2x−1=13−5x

∴7x=14

∴x=2

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