nth term of an AP = an = 7 - 4n
Common difference (= d) of an AP is the difference between a term and its preceding term.
∴ d = an - an - 1
= (7 - 4n) - (7 - 4(n - 1))
= 7 - 4n - 7 + 4n - 4
= - 4
∴ Common difference = - 4.
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