nth term of an A.P. is 4n -1 then find sum
of first 18 terms.
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Step-by-step explanation:
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Answer:
The sum of first 18 terms is 9 (142 - 17d).
Step-by-step explanation:
The nth term of an AP is:
a = first term
d = common difference
It is provided that the nth term is (4n - 1).
Then the relation between a and d is:
The sum of first n terms is:
For n = 18 compute the sum of first 18 terms as follows:
Thus, the sum of first 18 terms is 9 (142 - 17d).
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