What is the inside measurements for a 0.3 M 0.4 M 0.5 m 0.15 m 0.2 M how much space is inside the steps

(n^3 - n)

= n(n-1)(n+1)

since it is divisible by 3 and 2 ,because it is a multiple 3 consecutive number

if, n-1 is odd then n+1 is also odd, then it is a multiple of 9

but if, n-1 is even then n+1 is also even, then it is a multiple of 4

so, largest multiple = max(9*2, 4*3) = max(18, 12) = 18

47 - 90 = 43

43 - 180 = x

x = 137