ፋክቶሪያል
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| ቀ | ቀ! (የ ቀ ፋክቶሪያል) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 6 |
| 4 | 24 |
| 5 | 120 |
| 6 | 720 |
| 7 | 5,040 |
| 8 | 40,320 |
| 9 | 362,880 |
| 10 | 3,628,800 |
| 15 | 1,307,674,368,000 |
| 20 | 2,432,902,008,176,640,000 |
| 25 | 1.5511210043 × 1025 |
| 50 | 3.0414093202 × 1064 |
| 70 | 1.1978571670 × 10100 |
| 100 | 9.3326215444 × 10157 |
| 171 | 1.2410180702 × 10309 |
| 450 | 1.7333687331 × 101,000 |
| 1,000 | 4.0238726008 × 102,567 |
| 3,249 | 6.4123376883 × 1010,000 |
| 10,000 | 2.8462596809 × 1035659 |
| 25,206 | 1.2057034382 × 10100,000 |
| 100,000 | 2.8242294080 × 10456,573 |
| 205,023 | 2.5038989317 × 101,000,004 |
| 1,000,000 | 8.2639316883 × 105,565,708 |
| 1.0248383838 × 1098 | 101.0000000000 × 10100 |
| 1.0000000000 × 10100 | 109.9565705518 × 10101 |
| 1.7976931349 × 10308 | 105.5336665775 × 10310 |
ፋክቶሪያል በሂሳብ፣ ያንድ ሙሉ ቁጥር፣ ለምሳሌ «ቀ» (ፖዘቲቭ) ፋክቶሪአል ማለት በ «ቀ!» ሲመሰል፣ ትርጉሙም የተሰጠን ቁጥርና ከሱ በታች ያሉ ድርድር ቁጥሮች (እስከ 1) ተባዝተው የሚሰጡት ውጤት ማለት ነው።
ቀ! = ቀ*(ቀ-1)! = ቀ*(ቀ-1)*(ቀ-2)! =..... = ቀ.(ቀ-1).(ቀ-2).(ቀ-3).(ቀ-4).(ቀ-5) .....(3).(2).(1)
ለምሳሌ፦
የዜሮ ፋክቶሪያል ለየት ያለ ትርጉም ሲኖርው ውጤቱም 1 ነው ተብሎ በስምምነት ተተርጉሟል።