Answer:
Option 3 and 5
Step-by-step explanation:
- 5, 5, - 5, 5, - 5, .....
5 - ( - 5 )
= 5 + 5
= 10
- 5 - 5
= - 10
Here, common difference is not same, so this sequence is not an A.P
96, 48, 24, 12, 6
48 - 96 = - 48
24 - 48 = - 24
Here, common difference is not same, so this sequence is not an A.P
18, 5.5, - 7, - 19.5, - 32, .....
5.5 - 18 = - 12.5
- 7 - 5.5 = - 12.5
Here, common difference is same, so this sequence is an A.P
- 1, 3, - 9, - 27, - 81, .....
- 3 - 1 = - 4
- 3 - 9 = - 12
Here, common difference is not same, so this sequence is not an A.P
16, 32, 48, 64, 80, .....
32 - 16 = 16
48 - 32 = 16
Here, common difference is same, so this sequence is an A.P
