Question

28. Which term of the AP 21. 18. 15, ... is 0​

Answer 1

Answer:

n=8

Step-by-step explanation:

From the given question:

d= -3

a= 21

we know that

An= a + (n-1) d

0 = 21 + (n-1) (-3)

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

-21/-3 = n-1

n = 8

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