Question

5. The sum of first n natural number is 300. So the value of n will be
(A) 22 (B) 24
(C) 23
(D) 21
​

Answer 1

Answer:

d) 21

Step-by-step explanation:

hope it's help you...

: )

Answer 2

Answer:

Let n = 300

\begin{gathered}sn = \frac{n(n + 1)}{2} \\ \\ \: \: \: \: \: \: = \frac{300(300 + 1)}{2} \\ \\ \: \: \: \: \: \: = \frac{300(301)}{2} \\ \\ \: \: \: \: \: \: = 150(301) \\ \\ \: \: \: \: \: \: = 45150 \\ \\ \\ \end{gathered}

sn=

2

n(n+1)

=

2

300(300+1)

=

2

300(301)

=150(301)

=45150