I got this exercise from school and I have no idea what notion to use, it resumes to Harmonic series, I can't find a generic answer. Do you have any idea?
64×2+75×2+...+2119×2
Which is the generic answer for such a sum?
Answer
Consider the most general case A=b∑i=an2(n−2)=12b∑i=ann−2=12b∑i=an−2+2n−2 A=12b∑i=a1+b∑i=a1n−2=(b−a+1)+b∑i=a1n−2 So, you are just left with the sum of fractions 14+15+16+⋯+119
No comments:
Post a Comment