Question

(a-2d),(a-d),(a),(a+d). these terms are in A.P. or not? if yes then it is consicutive terms of A.P. or not??

Answer 1

yes the given terms are in AP as the common difference is same that is d
these are Consecutive terms

Answer 2

the given terms are in AP whose difference between 2 consecutive terms is d.
yes they are consecutive terms of the AP