1.

the formula to find sum S of first nnatural numbers is S=n(n+1)/2. find n if sum of first n natural numbers is 300

Answer»

N(n+1)/2=300
=>n(n+1)=300*2
=>n(n+1) = 600
=>n+1 = 600/n
=>n= 600/n -1
SOMETHING like this it will COME hope it helps


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