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VARVARA [1.3K]
3 years ago
15

A geometric secquence has: a3= 15 a6= 5/27; find common ratio

Mathematics
2 answers:
ss7ja [257]3 years ago
8 0

Answer:

a=5 while other a is 0.03

Lina20 [59]3 years ago
3 0

Answer:

Step-by-step explanation:

a_{n}=a_{1}*r^{n-1}\\\\a_{3} = 15

a_{1}*r^{3-1}=15\\\\a_{1}r^{2}=15 -------------------------------------(I)\\\\a_{6} = \frac{5}{27}\\\\a_{1} *r^{6-1}=\frac{5}{27}\\\\a_{1}r^{5}=\frac{5}{27}-----------------------(II)\\

(II) ÷ (I)

\frac{a_{1}r^{5}}{a_{1}r^{2}}=\frac{\frac{5}{27}}{15}\\\\\\r^{3}=\frac{5}{27}*\frac{1}{15}\\\\r^{3}=\frac{1}{27*3}\\\\r^{3}=\frac{1}{81}\\\\r=\frac{1}{3\sqrt{3}}

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============================================================

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