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Permutations And Combinations
Question
If a, b, c are in A.P. then prove that 
Solution
Since a, b, c are in A.P.
∴ b - a = c - b or 2b = a + c or 
...(i)
if 
[ By using (i)]
if 
or if 
if - 2ac = -2ac which is true
∴ 
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