Question

which term of the A .P is 21,18,15,.....is -81
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Answer 1

Answer:

35 th term is -81

Step-by-step explanation:

(first term) a = 21 (common difference) d = t2-t1 = 18-21

d= -3

(last term) l = -81

(no.of terms). n = [l-a/d]+1

= [ -81-21/-3 ]+1

= [ -102/-3 ]+1

= 34+1

n = 35

therefore, 35 th term is -81.

Hope this will help you.