Question

Which of the following is not an A.P. ?
(A) - 1.2,0-8, 2-8, ...
(B) 3, 3 + V2, 3 + 22,3 +372, ...
(C)
4 7 9 12
3'3'3'3"
-1 -2 -3
: 5 5 '***
(D)​

Answer 1

Answer:

(c)

Step-by-step explanation:

their d is different in each other

a = 4

d1 = 7 - 4 = 3

d2 = 9 - 7 = 2

Answer 2

Option A is only A.P .

We know A.P. is series in which the difference every consecutive number is constant .

So , in series 1 :

-1.2 , 0.8 , 2.8 , ....

Now , different of every consecutive number .

8 - (-1.2) = 2

2.8-0.8 = 2

Therefore , difference between each terms is constant .

So , this is an A . P .

Series 2 :

3 , 3 + 12 , 3 + 22 , 3 + 372 ....

Here , we can also see that the difference between each term is constant .

So , its also an A . P .

In series 3 :

4 , 7 , 9 , 12

So ,

7-4 = 3

9-7 = 2

12-9 = 3

Therefore , difference , is not constant .

So , this is not an A.P .

Learn More :

Arithmetic Progression

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