For an A.P. t2=1 and t6=13 then t1
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T6-T2=13-1
T1+5D-(T1+D)=12
T1+5D-T1-D=12
4D=12
D=3
......
T6=13
T1+5D=13
T1+15=13
T1=-1
HOPE IT HELPS
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