Question

1. Check that the list of numbers defined by tn = 9 - 11nis an AP or not.​

Answer 1

Answer:

Tn=9-11n

If

A=1,

9-11=-2

A=2

9-22=-13

A=3

9-33=-24

To find ‘d’,

-13-(-2)=-11

-24-(-13)=-11

Therefore this is an a.p

Step-by-step explanation:

Answer 2

Answer: Yes

Step-by-step explanation:

Tn = 9-11n

If n = 1

T1 = 9-11(1) = 9-11 = -2

Similarly T2 = 9-11(2) = 9-22 = -13

T3 = 9-11(3) = 9-33 = -24

We can see that the numbers are decreasing by 11, so they are in AP.

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