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lisov135 [29]
3 years ago
15

36, ___, ___, 32/3 is a geometric sequence, with some terms missing. First, please solve for "r", the common ratio between each

term. What is the value of r? Please enter your answer as a fraction, such as 6/7 or 1/5. *
Mathematics
2 answers:
grin007 [14]3 years ago
8 0

Answer:

\frac{2}{3}

Step-by-step explanation:

Given:

36, ___, ___, 32/3 is a geometric sequence

We need to find common ratio, r.

Solution:

As here is geometric sequence:-

First term = ar = 36

Fourth term = ar^{4} = \frac{32}{3}

r=?

We can write ar^{4} as ar\times r^{3}

( \ ar=36,  \ given)

ar^{4} =\frac{32}{3} \ given

ar\times r^{3}=\frac{32}{3}

36\times r^{3} =\frac{32}{3}

Dividing both sides by 36

\frac{36}{36} \times r^{3} =\frac{32}{3\times36} \\\\  r^{3} =\frac{32}{108} \\Taking\ cube\ root\ both\ sides\\\sqrt[3]{r^{3} } =\sqrt[3]{\frac{32}{108} } \\ \\ r=\sqrt[3]{\frac{8}{27} } \\ \\ r=\sqrt[3]{\frac{2\times2\times2}{3\times3\times3} }\\  \\ r=\frac{2}{3}

Thus, common ratio, r is \frac{2}{3}

2nd term = a r^{2} =ar\times r=36\times\frac{2}{3} =24\\

3rd term=ar^{3} =ar\times r^{2} =36\times (\frac{2}{3} )^{2} =36\times=\frac{4}{9} =16

Nikitich [7]3 years ago
5 0

Answer:

The geometric sequence is

36,24,16,\frac{32}3,.......

Step-by-step explanation:

The first term of the g.s is 36.

The 4th term of the given sequence is \frac{32}{3}.

The n^{th} term of the geometric sequence is

T_n=ar^{n-1}

Where a is the first term of the geometric sequence and r is the geometric sequence.

Then 4th term of the sequence is

T_4=ar^{4-1}

\Rightarrow \frac{32}3=36r^3

\Rightarrow  r^3=\frac{32}{3\times 36}

\Rightarrow r=\sqrt[3]{ \frac{8}{27}}

\Rightarrow r=\frac{2}{3}

Then, second term of the sequence   =36\times( \frac 23)^{2-1}

                                                              =36\times \frac 23

                                                             =24

The third term of the sequence is=36\times( \frac 23)^{3-1}

                                                       =36\times( \frac 23)^2

                                                        =16

The geometric sequence is

36,24,16,\frac{32}3,.......

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