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Question: Let x<sub>1</sub>, x<sub>2</sub>, x<sub>3</sub>…..be positive integers in AP such that x<sub>1</sub...

Let x1, x2, x3…..be positive integers in AP such that

x1 + x2 + x3 = 12 & x4 + x5 = 14 then x7 =

A

10

B

7

C

13

D

None

Answer

10

Explanation

Solution

a + a + d + a + 2d = 12 ̃ d = 6/5

a + 3d + a + 4d = 14 ̃ 2a + 7d = 14 a = 14/5

\ x7 = a + 6d = 145\frac { 14 } { 5 } + 365\frac { 36 } { 5 } = 10