Question

Which of the following is not an A.P?
a) 2,4,6,8,10.... b) -17, -12, -7, -2, 3,... c) 1.5,4,6.5,9... d) 1,4,9,16,25,....

Answer 1

Answer:

c

Step-by-step explanation:

Because A2-A1= 4

whereas A3-A2=-1

so the difference is no common

therefore it's not in AP