Logic puzzle-medium

1     2     3     4          5          6                             7                           8                         9                     10    

1     2     6     24     120        720                  5,040                   40,320                  362,880        3,628,806



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Hint: !

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Solution: ! is a factorial. A factorial means you should take that number and multiply by the numbers before it:
1!=1. 2!=2x1=2. 3!=3x2x1=6. 4!=4x3x2x1=24. 5!=5x4x3x2x1=120, and so on.
Zero is different though. Instead 0!=1 for some strange reason.(The same as 1!)

I got this problem from the puzzle "How can you use 5 0's to get 120 using any math equation?" The answer was this: (0! + 0! + 0! + 0! + 0!)! which made (1 + 1 + 1 + 1 + 1)! and then 5! which made 120.

+1 formula

1. Dream up 2 numbers, one two less than the other, say 2 and 4.
2. 2 x 4 = 8.
3.  In the middle of the two numbers is 3.Throw in another 3. 3 x 3 = 9 
4. 8 + 1 = 9

Try 8 and 10. 8 x 10 = 80. 9 x 9 = 81. 80 + 1 = 81

7 formula

 I have discovered a formula that, strangely, always equals 7. I hope you find this interesting‼

It works with any positive number but is easiest to calculate with an even number.

For Step 5, do the part in parenthesis first.

1. Pick an number.
2. Add one half to your number.
3. Multiply your original number by 10.
4. Add that number with your half from Step 2.
5. That number divided by your (original number plus a half) is 7.

Try it with the number 4:

1. Pick an number (4).
2. Add one half (2) to your number (makes 6).
3. Multiply your original number by 10 (40).
4. The 40  plus 2 equals 42.
5. 42 divided by 6 is 7.


Try 20. 20+10=30. 200+10=210. 210/30=7.