Question

Is it an A.p -21,-28,-35,-42?​

Answer 1

Step-by-step explanation:

The given sequence -21,-28,-35,-42

To find whether it is a A.P.or not

Here t1 = -21 , t2 =-28 , t3=-35 , t4 = -42

t2-t1 = -28-(-21) = -28+21 = -7

t3-t2 = -35-(-28) = -35+28 = -7

t4 - t3 = -42-(-35) = -42+35 = -7

the difference between two consecutive terms is constant. Therefore it is an A.P.