Find a way to use 1, 2, 3, and 4 to get 5.
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Answer:
9 + 3 + 1 + ......... = 13.5
Step-by-step explanation:
The series 9 + 3 + 1 + is the sum of an infinite geometric sequence. The first term of the series is 9 while the common ratio is 1/3;
to obtain the common ratio we obtain the quotient of any two successive terms, 3/9 or 1/3.
The sum of an infinite geometric series with first term a and common ratio r is given by;
Plug in the values of a and r into the formula;