1. How many terms are there in
the A.P. 14 /2 ,12,
,...
38?
Answers
Answered by
1
given:
A.P= 14/2, 12, ...
a= 14/2
d= 12-14/2
= 5
A(n)= -38
n=?
ATQ:
A(n)=a+(n-1)d
-38=14/2+(n-1)(5)
-38=7+(n-1)(5)
-38=7+(5n-5)
-38=7+5n-5
-38=2+5n
-38-2=5n
40=5n
n= 8
hence, there are 8 terms in the given A.P.
hope it helps
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