Q: What is the next number in the following series 3 9 27 81 243?

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243

The next number is 243, because 81x3=243.

243

-243

32

81 x 3 =243

Each number is 1/3 the value of the one to the left. The next number in the series is... 3.

243

It is 3 times 81 = 243

364.5 Each time, you're adding half of the previous number.

If you look at this series, you can see that each number is 2/3 of the one before it. The next number then is 2/3 * 32, which equals 64/3, or 21 1/3.

3 Each term is divided by 3 to produce the following term.

Each number is 3 times the previous number, so the next two numbers are 243 and 729: 3 x 81 = 243 3 x 243 = 729

243

243

7776

243

The differences between the pairs of numbers up to that point are 31, 32, 33, 34. If the difference between the fifth number and the sixth number is equal to 35, that would make the next number equal to 122 + 243 = 265.

243 is a composite number.

How about: 243 = 243.0

The number is 243 because 243/243 = 1 and any number divided by itself is always equal to 1

243 is one possibility.

243 is composite. 243 = 3 * 3 * 3 * 3 * 3 = 35

243 = 35

243 is a multiple of 1,7,21,81

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