A book sold 39600 copies in its first month of release. Suppose this represent 6.2% of the number of copies sold to date. How many copies have been sold to date?

(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

answer: translate the circles so they share a common center point and dilate circle y by a scale factor of 3.