Answer:
135
Explanation:
the pattern is that each number is multiplied by 3
5 x 3 = 15
15 x 3 = 45
45 x 3 = 135
Hope this was helpful :-)
A(n) = A(n-1) x 3
=> A(4) = A(3) x 3 = 45 x 3 =135
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