Question

निम्नलिखित में से कौन-सी श्रेणी A.P. नहीं है ?
Which of the following series is not an AP ?
A) 3,11,19...
B) 0.5, 1, 1.5...
C) 3.5,5.5,8.5...
D) 1,7,13...​

Answer 1

Answer:

C)

Explanation:

For any sequence to be AP there must be a common difference (say d).

The sequence is

3.5, 5.5, 8.5....

T1 = 3.5

T2 = 5.5

T3 = 8.5

For this to be an AP, T2 - T1 = T3 - T2

But 5.5 - 3.5 = 2 is not equal to 8.5 - 5.5 (which is 3)

Therefore it is not an AP

Answer 2

Answer:

option C. I am sure I am in 10th class