How many terms of the sequence
are less than or equal to 20?
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.
Thanks! that makes sense but how do you reconize the type of problem so easiely? ugh I appulaud the smarts!