Asked by Anonymous
Find the number of term s in the following arithmetic sequence.
3, 9, 15, 21... 123
3, 9, 15, 21... 123
Answers
Answered by
Reiny
a = 3 , d = 6
term(n) = a + (n-1)d
123 = 3 + (n-1)(6)
120 = 6n - 6
126 = 6n
n = 126/6 = 21
there are 21 terms
term(n) = a + (n-1)d
123 = 3 + (n-1)(6)
120 = 6n - 6
126 = 6n
n = 126/6 = 21
there are 21 terms
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