Question

20 using 4 4 4 4 ..?....................

Answer 1

⇒ 4! + 4 -4 -4

⇒ 4×3×2 + 4 - 8

⇒ 24 + 4 - 8

⇒ 28 - 8

⇒ 20 ,

Note :- If you don't know about '!' this , It is called a factorial , which is calculated as like ,

n! = n × n-1 × n-2 ..... upto so on ,

so ,

4! = 4×3×2×1 = 24

Answer 2

=(4/4+4)x4
=(1+4)x4
=5x4
=20