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Question

If in an A.P., T7=18,T18=7,then find T101

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Solution

T7=18=a+(71)d

a+6d=18 _______ (1)

T18=7=a+(181)d

a+17d=7 _______ (2)

(1)(2)

a+6da17d=187

11d=11

d=1

a6=18a=24

T101=a+100d

=24100

=76

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