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Question

Find a30a20 for the AP :a,a+d,a+2d,a+3d,...

A
60d
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B
50d
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C
10d
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D
32d
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Solution

The correct option is D 10d
Here the first term is a and the common difference is d.
nth term of the AP is given by,
an=a+(n1)d
a20=a+19d ...(1)
a30=a+29d ...(2)
On subtracting (1) from (2), we get
a30a20=10d

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