Question
In the arithmetic progression given below, find the common difference.
1, a, b, c, 9
Answer: Option D
:
D
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:
D
There are five terms in this AP
an = a1 + (n - 1)d
⇒ an−a1=(n−1)d
⇒ an−a1n−1=d
Here, a1=1; n=5; an=9
Therefore the common difference,
d=9−15−1=2
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