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Common Difference

The n th term...

Question

The nth term of an AP is (3n + 5). Find its common difference.

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Solution

We have:
T_n = (3n + 5)
Common difference = T₂ - T₁
T₁= 3 ⨯ 1 + 5 = 8
T₂ = 3 ⨯ 2 + 5 = 11
d = 11 - 8 = 3
Hence, the common difference is 3.

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