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Common Difference

The n th term...

Question

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

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Solution

We have:
T_n = (7 - 4n)
Common difference = T₂ - T₁
T₁= 7 - 4 ⨯ 1 = 3
T₂ = 7 - 4 ⨯ 2 = -1
d = -1 - 3 = -4
Hence, the common difference is -4.

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