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प्रश्न
Which of the following sequences are arithmetic progressions? For those which are arithmetic progressions, find out the common difference.
−225, −425, −625, −825, ...
उत्तर
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)
−225, −425, −625, −825, ...
Here
First term (a) = −225
`a_1 = -425`
`a_2 = -625`
Now, for the given to sequence to be an A.P,
Common difference (d) = `a_1 - a = a_2 - a_1`
Here
`a_1 - a = -425 - (-225)`
= -200
Also
`a_2 - a_1 = -625 - (-425)`
= -200
Since `a_1 - a = a_2 - a_1`
Hence, the given sequence is an A.P and its common difference is d = -200
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