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how do you come up with the number 11 using only 4 4,s?

Using only 4 number 4's, how do you come up with the number 11? Also using the same method to come up with 15 and 19. Please help!!!!

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Arthur D. | Effective Mathematics TutorEffective Mathematics Tutor
5.0 5.0 (9 lesson ratings) (9)
1
11=(4)/(0.4)+(4/4)
19=(4!)-4-(4/4) because 4!=4*3*2*1=24
 
Phillip R. | Top Notch Math and Science Tutoring from Brown Univ GradTop Notch Math and Science Tutoring from...
0
4 x 4 - 4/4 = 16 - 1 = 15