Question

the sum 'S of first N natural numbers is given by the relation S=n(n+1)/2. find n, if sum is 276. sum no. 20, answer fast

Answer 1

Answer:

Step-by-step explanation:

S is the sum

According to the given information

S=276

S=n(n+1)/2

276=n(n+1)/2

276x2=n²+n

552=n²+n

552-n=n²

552-68=n²

484=n²

n=√484

n=22

Answer 2

Step-by-step explanation:

this is right answer

i hope u understand