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There are different 10 circles. What is the number of the gr

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There are different 10 circles. What is the number of the gr

by Max@Math Revolution » Fri Apr 29, 2016 7:14 pm
There are different 10 circles. What is the number of the greatest possible points with which the circles intersect?

A. 90
B. 100
C. 110
D. 180
E. 200


* A solution will be posted in two days.
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by Max@Math Revolution » Wed May 04, 2016 6:47 am
2+2*2+...+2*9=2(1+2+...+9)=2(9)(10)/2=90
Hence, the correct answer is A.

- Forget conventional ways of solving math questions. In DS, Variable approach is the easiest and quickest way to find the answer without actually solving the problem. Remember equal number of variables and independent equations ensures a solution.
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