2 Answers

AlbatrossCafe · Answer 1 · 2017-04-06T12:12:57+0000

a 1 = 3, a 2 = 12, a 3 = 48, a 4 = 192,...
This is a geometric sequence.
To find any term of a sequence we use formula:
a n = a 1 * r^( n - 1 )
a 2 = a 1 * r
12 = 3 * r
r = 12 : 3
r = 4
Also: 48 = 12 * 4 and 192 = 48 * 4
The common ratio is : r = 4

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