Question
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 = 514 + 536 = 10