Question

Give the formula of summation ?

Answer 1

Hey there,

According to the formula of summation=
∑(1)=n
∑n=n(n+1)/2
∑n²=n(n+1)(2n+1)/6
∑n³=n²(n+1)²/4
∑k=kn
∑(n+k)=∑n+∑k
∑an=sn

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Answer 2

Sum of 1st n positive integers = n(n+1)/2

Sum of squares of 1st n positive integers = n(n+1)(2n+1)/6

Sum of cubes of 1st n positive integers = n^2(n+1)^2/4.


Hope this helps!