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Question

The nth term of an AP is (7 - 4n). Find its common difference.

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Solution

Given the nth term is 7 - 4n

an=74n

Put n = 1,

a1=74×1=74=3

Put n = 2,

a2=74×2=78=1

Common difference d=a2a1=13=4

So common difference of the AP is -4


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