Question

How many subshells are associated with n is equal to 4?

Answer 1

formula for that is
L(number of subshells)=0 to( n-1)
put n = 4
L= 0 to 3
so it's 0,1,2,3
silk there are four sub shells

Answer 2

n - 4 

l = subshells 

l = n - 1 

l = 3 subshells