Which two values are solutions of the inequality r≥6? Select one:

r = 6, r = 9

r = −7, r = −8

r = 3, r = −10

r = 4, r = −2

Answer is in the file below

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(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

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