The 3rd term of an A.P is 4x - 2y and the 9th term is 10x...
The 3rd term of an A.P is 4x - 2y and the 9th term is 10x - 8y. Find the common difference.
19x - 17y
8x - 4y
x - y
2x
Correct answer is C
n = 3, U3 = 4x - 2y,
Un = a + (n-1)d,
4x - 2y = a + 2d... (1)
U9 = 10x - 8y,
10x - 8y = a + 8d... (2)
Solving (1) and (2),
subtract eqn i from ii
a-a + 8d - 2d = 10x -4x - 8y- (-2y)
6d = 6x - 8y+ 2y.
6d= 6x - 6y
6d = 6( x-y)
d = x - y
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