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in Arithmetic Progression by (30.9k points)
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Write the common difference of an A.P. whose nth term is an = 3n + 7.

1 Answer

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Best answer

If an = 3n + 7 Then 

a1 = 3 (1) + 7 = 10 

a2 = 3(2) + 7 = 13 

a3 = 3(3) + 7 = 16

d= common difference = an – an–1 

= a3 – a2 

= 16 – 13 = 3

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