Question

Which term of an A.P., 21, 18, 15, ..... is – 81 ? Is any term of given A.P., is 0 ? Why ?
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Answer 1

Step-by-step explanation:

$nth \: term \: of \: ap \: = \\ 1st \: term + (n - 1) \times common \\ difference$

-81=21+(n-1)(-3)

by solving we get n is equal to 35

similarly