if a,b,c are in A.P then a+c=
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if these are in AP then a+c= 2b
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Since a, b and c are in AP
The common difference is constant.
T2 - T1 = T3 - T2
=> b - a = c - b
=> b + b = c + a
=> a + c = 2b
The common difference is constant.
T2 - T1 = T3 - T2
=> b - a = c - b
=> b + b = c + a
=> a + c = 2b
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