Question

5. Sum of series : 1+2+3+ …………………… + n is

()

(+1)

2

() ( + 1) ()

(+1)(+2)

2

() none of these.​

Answer 1

Answer:

$\huge\underbrace\mathfrak\red{answer}$

$<b><marquee>$

░▒▓█ Hello █▓▒░

put the formula of AP

Answer 2

Answer:

Step-by-step explanation:

The sum of the series 1+2+3+...+n is given by the formula:

sum = n(n+1)/2

Therefore, the answer is (2), which is:

sum = n(n+1)/2 = (n^2 + n)/2

For example, if we want to find the sum of the series 1+2+3+...+10, we plug in n=10:

sum = 10(10+1)/2 = 55

So the sum of the series 1+2+3+...+10 is 55.