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Jan
29
revised Smallest Non-negative number in a matrix
added 482 characters in body
Jan
29
answered Smallest Non-negative number in a matrix
Oct
29
comment Can elements in a set be duplicated?
Sets does not have repeated elements. n(A) equals 7.
Oct
8
comment Is the empty set a power set?
Isn't $\{\emptyset\}$ different from $\emptyset$?
Oct
8
answered GRE 9378 question 23
Oct
8
comment What is a hexagon?
According to wikipedia, it has 6 edges and 6 vertices. The lines should not cross each other to create extra vertices.
Oct
6
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