Question
If 
are in A.P., then prove that 
are in A.P.
Solution
will be in A.P.if
will be in A.P. (By adding 1 to each number)if
will be in A.P. if
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will be in A.P. (By dividing each number a + b + c)if
if 
if
if (b - a) (b + a) = (c - b) (c + b)if
if
are in A.P. which is true.Hence,
are in A.P.
