Question 1094751: Etermine the number of terms in the sequence -16,-12,-8,...,60
Found 3 solutions by ikleyn, MathTherapy, greenestamps:
Answer by ikleyn(52787)   (Show Source):
You can put this solution on YOUR website! .
Arithmetic progression from -16 to 60 with the common difference of 4.
How many intervals of the length 4 are there between -16 and 60 ?
Answer:  =  = 19.
Hence the number of terms in the given AP is 19+1 = 20.
Answer. 20 terms.
Answer by MathTherapy(10552)  (Show Source):
Answer by greenestamps(13200)  (Show Source):
You can put this solution on YOUR website!
To find the number of terms there are in the sequence AFTER THE FIRST ONE, divide the difference between the first and last terms by the common difference:
Since that is the number of terms after the first, the number of terms in the sequence is 20.
Note that in a response from another tutor, she said the number of intervals between the numbers is 19, and that makes the number of numbers in the sequence 20. You might try looking at the problem that way instead of the way I explained it; perhaps one or the other of those two ways makes more sense to you.
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