Question

Which of the following is not an AP 1) 5,12,19,26
2) 2,-2,-6,-10.....
3) 1,2.2 ,3.3.......
4) 3/2, 1/2, -1/2..........​

Answer 1

Answer:

the 3rd option is not an AP

Answer 2

Answer:

3

d1=2.2-1=1.2

d1=3.3-2.2=1.1

so

d1 not equal to d2

thats why given series is not in ap