Christina B.
asked • 03/05/21please help meeee!!!
What is the 20th term of the sequence below?
2, 6, 18, 54, …
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1 Expert Answer
For a geometric sequence a(n) = a(1) r^n-1, where a(n) is the nth term, a(1) is the first term, r is the ratio between terms
For the given sequence, each number is 3 times the previous number, so r is 3
a(1) is given as 2, n = 20 so
a(20) = 2 * 3^19 = 2,324,522,934
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Brenda D.
03/05/21