2. Simon has to learn 155 words. If he learns 5 words every day. How many days will be take to learn all the words?

31 days

Step-by-step explanation:

155/5=31

31

Step-by-step explanation:

155 divided by 5 equals 31

(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