T6=a+(6-1)d=20
T7=a+(7-1)d=42
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a+5d=20.......(1)
a+6d=42........(2)
(2)-(1)....
we get d=22
a+5×22=20
a+110=20
a=-90
may be it's the ans
a+6d=42........(2)
(2)-(1)....
we get d=22
a+5×22=20
a+110=20
a=-90
may be it's the ans
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