The 3rd term of an A.P is 4x - 2y and the 9th term is 10x - 8y. Find the common difference.
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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), d = 6(x-y)/6
d = x-y.
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), d = 6(x-y)/6
d = x-y.