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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