Question

10. Which term of the AP: 21, 18, 15,
is -81 ?​

Answer 1

Step-by-step explanation:

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Answer 2

Answer:

a = 21

d= 18-21

d = -3

an = ?

= a + (n - 1) d

= 21 +(n - 1) (-3)

= 3(n -1) =21

= 3n = 24

n = 24/3

n = 8