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Grade 12 math · E.1 · Limits

Sum an infinite geometric series

The sum is the first term divided by one minus the ratio.

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  1. An infinite geometric series has a first term of 35 and a common ratio of 1/6. Find its sum.

    Answer: 42

  2. An infinite geometric series has a first term of 24 and a common ratio of 1/4. Find its sum.

    Answer: 32

  3. An infinite geometric series has a first term of 36 and a common ratio of 1/3. Find its sum.

    Answer: 54

Tip: The sum is the first term divided by one minus the ratio.

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