Question

decide whether the following sequence is an A. P or not find the common difference -10,-6,-2,2,.............
ans

Answer 1

Yes it form Ap d = a2-a1 = -6+10 =4
also d= a3-a2 = -2+6=4
Since the common difference is same it will form Ap

Answer 2

-10,-6,-2,2
d= a2-a1 = -6-(-10)= -6+10 =4
a3-a2= -2-(-6)= -2+6=4
Since,a2-a1= a3-a2

Therefore, it is an A.P.

Hope it helps you . :-)