Question

n formula in number sequence​

Answer 1

Answer:

Such sequences can be expressed in terms of the nth term of the sequence. ... In this case, the nth term = 2n. To find the 1st term, put n = 1 into the formula, to find the 4th term, replace the n's by 4's: 4th term = 2 × 4 = 8.

Answer 2

Answer:

To find the number of terms in an arithmetic series, use the given formula:

$n = \frac{an - a1}{d} + 1$

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