write the sum using sigma notation

Question

Write the sum using sigma notation:

1+2+3+4+.....+105=ΣB n=1

A=

B=

Answer 1

I think what you are asking is to write the expression for the sum of the first 105 natural numbers using the sigma notation.  As best the scripting allows we have

Σ_k=0¹⁰⁵k, where the subscript and superscript are normally written under and over the sigma.

The sum itself is (105)(106)/2