Question

if in AP first term is -18 common difference= 2 and nth term is 0 find the value of n​

Answer 1

Answer:

10th term

Step-by-step explanation:

an = a + (n - 1)d

0 = -18 + (n - 1)2

0 = -18 + 2n - 2

0 = -20 + 2n

-2n = -20

n = -20/-2 = 10

10th term is 0

Answer 2

we know:

$a + (n - 1)d = an \\ = > ( - 18) + (n - 1) \times 2 = 0 \\ = > - 18 + 2n - 2 = 0 \\ = > 2n - 2 = 0 + 18 = 18 \\ = > 2n = 18 + 2 = 20 \\ = > n = \frac{20}{2} = 10$

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