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Question
Which of the following sequences are arithmetic progressions? For those which are arithmetic progressions, find out the common difference.
0, −4, −8, −12, ...
Solution
In the given problem, we are given various sequences.
We need to find out that the given sequences are an A.P or not and then find its common difference (d)
0, −4, −8, −12, ...
Here
First term (a) = 0
`a_1 = -4`
`a_2 = -8`
Now, for the given sequence to be an A.P,
Common difference (d) = `a_1 - a = a_2 - a_1`
Here
`a_1 - a = -4 - 0`
= -4
Also
`a_2 - a_1 = -8 - (-4)`
= -4
Since `a_1 - a = a_2 - a_1`
Hence, the given sequence is an A.P and its common difference is d = -4
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