# Question: ssorry i have several question to ask in the textbook...

###### Question details

ssorry

i have several question to ask in the textbook

it said "sum of the terms in each bracket is >= 1/2",but how do they know this is true

i know 1/5+1/6+1/7+1/8>1/2 or 1/3+1/4>1/2

but i am not sure how the conclusion extends into infinite number of terms thank you