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1.2.3. + 2.3.4 + 3.4.5 + . . . upto n t...

`1.2.3. + 2.3.4 + 3.4.5 + . . . ` upto n terms `=(n (n + 1) (n + 2) (n + 3))/( 4)`

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p (n) is true for all `n in N `
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