May I ask what is the definition of Nilpotent matrix. I suppose that is A^k =0 for some k? If I am right, then 0 must be an eigenvalue of A, then there is some issues for the test problems.
@Ling Liang , take some tolerance while checking the equality of eigen value with zero.
Remove all the consonants
Sums with Excluded Digits
What number has this problem?
Sum of series VI
Sum of series VII
Sum of series I
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