Sequence And Series Question 273
Question: The sum of first $ n $ natural numbers is
[MP PET 1984; RPET 1995]
Options:
A) $ n,(n-1) $
B) $ \frac{n,(n-1)}{2} $
C) $ n,(n+1) $
D) $ \frac{n,(n+1)}{2} $
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Answer:
Correct Answer: D
Solution:
We know that natural numbers are $ 1,\ 2,\ 3,\ 4,\ ……..n $ are in A.P. Now sum $ =\frac{n}{2}[2\times 1+(n-1)1]=\frac{n}{2}(n+1) $ .
BETA
