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| 1. |
n(n+1)(n+5) is a multiple of 3 |
| Answer» 1.Let n=11 (1+1)(1+5)12 which is divisible by 32.n=mm (m+1)(m+5) =3x (m+5)=3x/m(m+1)................................................13.n=m+1(m+1)(m+2)(m+5)3x/m (m+1)×(m+1)(m+2)hence divisible by 3 | |