How many terms of the sequence

\(\sqrt{1},\sqrt{2},\sqrt{3},\sqrt{4},\ldots \)

are less than or equal to 20?

SydSu22 Oct 19, 2018

#2**+3 **

To solve this, we first have to find the biggest term in the sequence, this is obviously the square root of 400. Since we know that the sequence is increasing by 1 for each step, we can conclude that there are exactly 400 terms.

CalculatorUser Oct 19, 2018

#3**+1 **

Thanks! that makes sense but how do you reconize the type of problem so easiely? ugh I appulaud the smarts!

SydSu22 Oct 19, 2018

#5**+2 **

Thanx for the compliment....! ( but I am more like a slide rule or abacus )

ElectricPavlov
Oct 19, 2018