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1. |
The nth term of an AP is (7 – 4n). Find its common difference. |
Answer» Nth term = an = 7 – 4n a(n-1) = 7 – 4(n – 1) = 11 – 4n Common difference = d = an – a(n-1) = (7 – 4n) – (11 – 4n) = 7 – 4n – 11 + 4n = -4 Therefore, common difference is -4. |
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