Question

add all the number from 1 to 200​

Answer 1

Sn =n(n+1)/2

=200(200+1) /2

=100(201)

=20100

Therefore the sum of all no. From 1 to 200 is 20100

Answer 2

Answer:

$\frac{n(n + 1)}{2} \\ \\ \frac{200 \times 201}{2} \\ \\ 100 \times 201 \\ \\ 20100$

your answer is 20100

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