Question

4!×[1-1/1!+1/2!-1/3!+1/4!]

Answer 1

4!×(0/1! + 1/2×1-1/1×2×3+1/1×2×3×4)
4!×(0+1/2-1/6+1/24)
4!×([12-4+1]/24)
4!×(9/24)
(4×3×2×1×9)/24
=9

Answer 2

The Answer of this question is 9