Derive the nth term of a sequence

Aceix · Mar 23, 2015

How do i go about deriving a general eqn for the nth term of a sequence provided an eqn of the sum to the nth term is given in terms of n?

phyzguy · Mar 23, 2015

Rather than give you the answer, try a discrete example. Think of it this way. I know:
Sum₄ = a₁+a₂+a₃+a₄
and I know
Sum₃ = a₁+a₂+a₃ .

How would I find a₄ in terms of Sum₄ and Sum₃?

Aceix · Mar 24, 2015

phyzguy said:

Rather than give you the answer, try a discrete example. Think of it this way. I know:
Sum₄ = a₁+a₂+a₃+a₄
and I know
Sum₃ = a₁+a₂+a₃ .

How would I find a₄ in terms of Sum₄ and Sum₃?

phyzguy · Mar 24, 2015

Does your blank reply mean you don't know?

Aceix · Mar 24, 2015

phyzguy said:

Does your blank reply mean you don't know?

i meant thanks.

Aceix.

phyzguy · Mar 24, 2015

OK. You're welcome.

Derive the nth term of a sequence

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