Question

Is given sequence 3,5,7,9,12,15 an A.P​

Answer 1

Answer:

no

Step-by-step explanation:

3+2=5

5+2=7

7+2=9

9+2=11 but here it's given 12

same reason for next

Answer 2

Answer:

No. The given sequence is an AP.

Step-by-step explanation:

if a2-a1 = a3-a2 i.e. d is same then it is an AP

so here, a2= 5 and a1= 3

∴ a2-a1 = 5- 3

= 2

and also a3=7

∴ a3- a2= 7-5

= 2

but a4=9 and a5=12

∴ a5-a4=3

∴ a2-a1 = a3-a2 but not equal to a5-a4 so it is not an AP.