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Hey, i need help with this question. can anyone help me?

Hey, i need help with this question. can anyone help me?-example-1

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4 votes
The answer is 47 or the other answer connected to it is 23
User Whyoz
by
8.5k points
7 votes

SOLUTION

The given sequence is:


7,21,63,189,\cdots

The first term of the sequence is 7.

Notice that the sequence has a common ratio of:


r=(21)/(7)=(63)/(21)=\cdots=3

The recursive formula of a geometric series is:


a_n=a_(n-1)(r)

Substituting r=3 gives:


a_n=3a_(n-1)

User Andrej
by
8.3k points

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