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Find the Indicated Terms in the Following Sequences Whose Nth Terms Are: An = (N − 1) (2 − N) (3 + N); A1, A2, A3 - CBSE Class 10 - Mathematics

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Question

Find the indicated terms in the following sequences whose nth terms are:

an = (n − 1) (2 − n) (3 + n); a1, a2, a3

Solution

an = (n − 1) (2 − n) (3 + n)

We need to find `a_1, a_2, and a_3`

Now, to find  `a_1` term we use n = 1 we get

`a_1 = (1 - 1)(2- 1)(3 + 1)`

= (0)(1)(4)

= 0

Also to find `a_2` term we use n = 2 we get

`a_2 = (2 - 1)(2 - 2)(3 + 2)`

= (1)(0)(5)

= 0

Similarly, to find `a_3` term we use n = 3 we get

`a_3 = (3 -1)(2 - 3)(3 + 3)`

= (2)(-1)(6)

= -12

Thus `a_1 = 0, a_2 = 0` and `a_3 = -12`

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Solution Find the Indicated Terms in the Following Sequences Whose Nth Terms Are: An = (N − 1) (2 − N) (3 + N); A1, A2, A3 Concept: nth Term of an AP.
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