Question

A sequence is said to be AP's only when

Answer 1

When the Second term - First term = 3rd term - 2nd.

Example of an AP is: 1, 3, 5, 7, etc.

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Answer 2

Answer:

A sequence is called AP only when it has fixed common difference between it's two consecutive terms.

Step-by-step explanation:

If a sequence has fixed common difference between it's two consecutive terms, only then it is called an AP.

For example,

a, b, c, d is a sequence.

It will be called an AP only if

$b - a = c - b= d - c$

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