Which term of A.p.,21,18,15...,is -81?
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Answered by
7
Answer:
which term of A.p.,21,18,15...,is-81?
Step-by-step explanation:
a=21,d=18-21=-3,an=-81,n=?
an=a+(n-1)d
-81=21+(n-1)*(-3)
-81-21=(n-1)(-3)
-102=(n-1)(-3)
-102/-3=(n-1)
34+1=n
n=35
Answered by
2
Answer:
Step-by-step explanation:
a=21,d=18-21=-3,an=-81,n=?
an=a+(n-1)d
-81=21+(n-1)*(-3)
-81-21=(n-1)(-3)
-102=(n-1)(-3)
-102/-3=(n-1)
34+1=n
n=35
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