Correct Answer: Option C

Explanation

n = 3, U\(_3\) = 4x - 2y,
U\(_n\) = a + (n-1)d,
4x - 2y = a + 2d... (1)

U\(_9\) = 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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