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3. factorise kk1k23k1k2 hence prove that nn1n2 is divisible by 3...

# Question: factorise kk1k23k1k2 hence prove that nn1n2 is divisible by 3...

###### Question details

Factorise k(k+1)(k+2)+3(k+1)(k+2), hence prove that n(n+1)(n+2) is divisible by 3 for all positive intergers n.