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Set M consists of the consecutive integers from -15 to y, inclusive. If the sum of all the integers in set M is 70, How many numbers are in the set?

2 answers

a. 33
b. 34
c. 35
d. 36
e. 37
-15 to +15 includes 31 integers, counting zero. The sum is zero.
so 16+17+18+19=70 (ie, 17.5 x 4).

so I count 31+5 integers.
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