Question

What is the 21St term of the arithmetic sequence 21, 20,19?

Answer 1

Answer:

21st term = 1

Step-by-step explanation:

First term (a) = 21

common difference (d) = second term - first term

= 20- 21 = -1

nth term = a + (n - 1) d

= 21 + ( 21-1) × (-1)

= 21 - 20

= 1