The algebraic form of an arithmetic sequence is 7 n−3 . a) What is its common difference ? *
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Answer:
7
Short trick:
Common difference is mostly the co-efficient of n in algebraic form of an arithmetic sequence.
Step-by-step explanation:
Let the first term be a1 and second term be a2
a1 = 7(1) - 3 = 7 - 3 = 4
a2 = 7(2) - 3 = 14 - 3 = 11
Common difference = a2 - a1 = 11 - 4 = 7
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