| 72 | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Numbers 0 - 99 | |||||||||
| 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |
| 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 |
| 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 |
| 30 | 31 | 32 | 33 | 34 | 35 | 36 | 37 | 38 | 39 |
| 40 | 41 | 42 | 43 | 44 | 45 | 46 | 47 | 48 | 49 |
| 50 | 51 | 52 | 53 | 54 | 55 | 56 | 57 | 58 | 59 |
| 60 | 61 | 62 | 63 | 64 | 65 | 66 | 67 | 68 | 69 |
| 70 | 71 | 72 | 73 | 74 | 75 | 76 | 77 | 78 | 79 |
| 80 | 81 | 82 | 83 | 84 | 85 | 86 | 87 | 88 | 89 |
| 90 | 91 | 92 | 93 | 94 | 95 | 96 | 97 | 98 | 99 |
72 (seventy-two) is a positive integer following 71 and preceding 73. Its ordinal form is written "seventy-second" or 72nd.
Properties[]
72 is an even composite number.
Rule of 72[1] is a method for estimating the time required for a given principal to double. It is calculated as t = ln 2 / (ln(1+r)) and can be approximated as \(t \approx 0.72/r\). It is especially used in finance to estimate an investment's doubling time. For example, when the rate is 6%, 0.72/0.06 = 72/6 = 12 years is required to double the investiment, where the actual value is about 11.896.
In googology[]
In Greek-based number-naming systems, 72 is associated with prefix "duheptaconta-", and with prefix "duoseptuaginti-" in Latin systems.
In shogi[]
It is also the number of possible pawn moves (by a given player) in shogi.
In TV broadcasting[]
In the Americas, the mid gap in the Band I starts at 72 MHz.
Sources[]
- ↑ MathWorld, Rule of 72