Find the 18th term of the AP 1 5 9
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Answer: 69
Step-by-step explanation:
AP:--- 1 ,5 ,9 ....
Here we can observe that ,
a=1
d = 5-1 = 4
n = 18
.
.
Since , A. n= a + (n-1) *d
A 18 = 1+(18-1)*4
=1+17*4
=1+68
=69
Hence the 18th term of that AP is 69
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