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T1 = 1
T2 = 3
T3 = 5
T4 = 8
T4 -T3 = 8-5 = 3
T3-T2 = 5-3 = 2
The common difference is not constant
So they are not in AP
T2 = 3
T3 = 5
T4 = 8
T4 -T3 = 8-5 = 3
T3-T2 = 5-3 = 2
The common difference is not constant
So they are not in AP
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