Sum of first n natural no. Is S ans S=n(n+1)/2. If S=55 then find value of n.

Question

Anna · Answer

Step-by-step explanation:   55=n(n+1)/2  110=n²+n  n²+n-110=0  n²+11n-10n-110=0  n(n+11)-10(n+11)=0  n=10

Allison · Answer

Answer:   10   Step-by-step explanation:   S= n/2+(2a+(n-1)d)  55= n/2 + (2 + (n-1))  110= 2n-n+n²  n²+n-110=0  n²+11n-10n-110=0  n(n+11) -10(n+11)=0  n= 10, -11  n≠ -11  so the value of n is 10

Nevaeh

c) File

Insert d) File Place

3. Each column in a table is referred as —-. a) tuple b) attribute c) schem

Change the sentences into negative.
a. Tomorrow is a holiday.
b. The dogs are barking.
c. She will meet me tomorrow

2 thoughts on “Sum of first n natural no. Is S ans S=n(n+1)/2. If S=55 then find value of n.”