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vovangra [49]
3 years ago
10

Write an explicit formula for an, the nth term of the sequence 63, 21, 7,

History
2 answers:
timurjin [86]3 years ago
4 0

63/3=21

21/3=7

7/3=7

        -

        3

bagirrra123 [75]3 years ago
3 0

Answer:

\Large \boxed{\sf 7 \times 3 ^{3-n}}

Explanation:

This is a geometric sequence

Use nth term of geometric sequence formula

a_1 \times r^{n-1}

Ratio is 27/63=1/3

First term is 63

\displaystyle 63 \times (\frac{1}{3}) ^{n-1}

Simplify expression

\displaystyle 7 \times 3 ^{3-n}

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