Question

a,2a,3a,4a,..........

Answer 1

5a,6a,7a,8a,....... so on

Answer 2

Answer:-

$\small\sf{a2-a1=2a-a=a}$

$\small\sf{a3-a2=3a-2a=a}$

$\small\sf{a4-a3=4a-3a=a}$

━━━━━━━━━━━━━━━

The difference between the successive terms are same.

Hence, it is an AP

━━━━━━━━━━━━━━━

Common difference, next three terms of this AP are as follows:

$\small\sf{a5=a4+d=4a+a=5a}$

$\small\sf{a6=a5+d=5a+a=6a}$

$\small\sf{a7=a6+d=6a+a=7a}$