Intelligent Math Puzzle – Challenge 83
If you REALLY enjoy solving complicated math puzzles and exercising your brain, then this math challenge is just for you!

Challenge:
(-70) + (-60) + (-50) + (-40) + … + n = ?
If the pattern of the above operation continues, which of the following could be the answer?
A- 90
B- 100
C- 150
D- 170
E- 200
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The correct answer is D.
The first number in the equation is -70 and the next item is 10 more than the previous number. If the pattern continues, the sum of all numbers till number +70 is 0. Why?
The next number is 80 and the number after that is 90.
80 + 90 = 170The Best Books to Ace Algebra
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