which term of the AP:21,18,15,...is -81? Also , is ant term 0? Give REASON for YOUR ANSWER.......
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Answered by
3
Answer:
number of terms= 33 , zero is it's 8th term
Step-by-step explanation:
AP= 21, 18, 15, .............-81.
first rerm (a) = 21
common difference (d) = -3
let number of terms = n
since nth term = a+(n-1) d
-81= 21+(n-1) (-3)
-81 - 21 = -3n+3
=> 3n-3= 102
=> n= 33
we have to find 0 is aterm or not,
let 0 be the pth term
=> a+(p-1) d = 21+(p-1)(-3) = 0
=> 3p-3 = 21
=> 3p= 24
=> p= 8
therefore 0 is 8th term of the given AP
Answered by
6
Step-by-step explanation:
HLW...da....
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