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Write the first three terms of the seque...

Write the first three terms of the sequence defined by `a_(n) = n(n+1)`

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Given `a_(n) = n(n+1)`
substitiuting n = 1,2 and 3 , we get
`a_(1) = 1 (1 + 1 ) = 2`
`a_(2) = 2 (2 + 1) = 6`
` a_(3) (3 + 1) = 12 `
`therefore ` The first terms of the given sequence are 2 . 6 and 12.
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