Recurring Decimals and Geometric Series (HSC SSCE Mathematics Advanced): Flashcards

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Recurring Decimals and Geometric Series
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Limiting sum formula for infinite geometric series

Sinfty=a1rS_{infty} = \frac{a}{1-r}

Condition for limiting sum formula to work

r<1|r| < 1

Common ratio when 2 digits recur

r=0.01r = 0.01

Common ratio when 3 digits recur

r=0.001r = 0.001

What recurring decimals represent mathematically

Infinite geometric progressions

Value of 0.2˙7˙0.\dot{2}\dot{7} as a fraction

311\frac{3}{11}

Handling non-recurring parts in mixed recurring decimals

Add them separately to the recurring part's sum

What aa represents in S=a1rS_{\infty} = \frac{a}{1-r}

First term of the recurring part

What rr represents in S=a1rS_{\infty} = \frac{a}{1-r}

Common ratio of the geometric series

Final step after applying limiting sum formula

Simplify the fraction to lowest terms

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