Answers

2016-06-25T15:27:53+08:00
The common difference is
3 :)
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  • Brainly User
2016-06-25T18:09:24+08:00
An = 3n - 12

Say, n=5; n=6; n=7

a₅ = 3(5) - 12 = 3

a₆ = 3(6) - 12 = 6

a₇ = 3(7) - 12 = 9

Common difference:
a₆ - a₅ = 6 - 3 = 3
a₇ - a₆ = 9 - 6 = 3

ANSWER:  The common difference is 3.
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