find missing number in array

[songz]

return missing number in an input array of consecutively increasing numbers.

i: [5,6,8,9]
o: 7

[Himanshu1495]

Can i try this one using python? @songz

[songz]

yes @Himanshu1495 , but you would have to do it in your own environment. :)

[Himanshu1495]

Can you please review the solution @songz ?