Question

Is the progression 3,9,15,21....is in Ap​

Answer 1

Answer:

D=A2-A1=A3-A2=A4-A3

D=9-3=15-9=21-15

D=6=6=6

so this progressions in AP

Answer 2

Answer:

D= A2-A1=9-3=6

D=,,,,,,,,,,,,,,15-9=6

D=,,,,,,,,,,,,,,21-15=6..

this progression is in ap.......