Question

t2=1and t7=-11,find the AP

Answer 1

Since,
t2=1
a+d=1....{1}
Again,
t7=-11
a+6d=-11......{2}
Now ,subtracting {1}&{2}, we get:
d=2
Now by putting value of d in {1}; we get,
a=-1
Thus required APis -1,1,3,5......

Hope it helps you....