Microsoft Excel, how to find a jumping number in a list of numbers, such as 1, 2, 3, 5, 6, 7, with a 4 in the middle, and why? ...

A 1? Enter 1, A2 enter 2. . . There are a few numbers missing randomly in the middle.

Enter the formula in B 1 = IF(A2- 1 & lt; & gtA 1," X ","")

Copy the formula of B 1 and display the missing position directly.