Sandra needs 2 3/4 cups of flour for one kind of cookie and 3 3/8 cups for another kind. how much would she need for both kinds?

Step-by-step explanation:

As given

i.e

L.C.M of (4,8) = 8

(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