Question

You have been given four 4’s and you are required to generate numbers between 1 to 20 using these 4 fours. You can use operations + ,-,*,/ . Challenge is that you must use all the fours along with any operation to generate a number.

Answer 1

Hi there!
hmm.. sounds like it's a Brain Teaser!

Let's try 'em :-

1 = 44 / 44

2 = 4 /√4 + 4 - 4

3 = 4! / 4!! × 4 / 4

4 = 4!! / (4 + 4) × 4

5 = 4 + (√4 + √4) / 4

6 = 4! / 4 + 4 - 4

7 = 4! / 4 + 4 / 4

8 = (4 + 4) × 4 / 4

9 = (4! / 4 /√4)⁴

10 = 44 / 4.4

11 = 4 / .4 + 4 / 4

12 = 4/ .4 + 4 /√4

13 = 4!! + 4 + 4 / 4

14 = 4!! + 4 + 4 /√4

15 = (√√√4)⁴! - 4) / 4

16 = 4⁴! - 4 - 4

17 = (√√√4)⁴! + 4) / 4

18 = 4·4 + 4 - √4

19 = 4!! / .4 - 4 / 4

20 =  (4 + 4 / 4) × .4


Hope it helps! :)

Answer 2

1 = 44 / 44
2 = 4 /√4 + 4 - 4
3 = 4! / 4!! × 4 / 4
4 = 4!! / (4 + 4) × 4
5 = 4 + (√4 + √4) / 4
6 = 4! / 4 + 4 - 4
7 = 4! / 4 + 4 / 4
8 = (4 + 4) × 4 / 4
9 = (4! / 4 /√4)⁴
10 = 44 / 4.4
11 = 4 / .4 + 4 / 4
12 = 4/ .4 + 4 /√4
13 = 4!! + 4 + 4 / 4
14 = 4!! + 4 + 4 /√4
15 = (√√√4)⁴! - 4) / 4
16 = 4⁴! - 4 - 4
17 = (√√√4)⁴! + 4) / 4
18 = 4·4 + 4 - √4
19 = 4!! / .4 - 4 / 4