The first term of an ap is -7 and the common difference is 5 find its 18th term and general term
The first term of an ap is -7 and the common difference is 5 find its 18th term and general term
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general term
an=-12+5n
Answer:
The 18th term is 78 and the general term is
Step-by-step explanation:
First term = a = -7
Common difference = d= 5
Formula of nth term :
So, general term of A.P. =
=
=
Thus the general term of given A.P. =
Now to find 18th term
Substitute n = 18 in general term
Hence the 18th term is 78 and the general term is