Exam Maths Puzzle General Ability General Knowledge

in how many ways 5 members be selected out of 10 members,so that any two particular members always excluded

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Exam Other Question
Given that, X and Y are non-negative .What is the Value of X ?
(I) 2X + 2Y <= 40
(II) X -2Y >= 20 Find the last digit of 1^3 + 2^3 + .............99^3

1) 0
2) 1
3) 2
4) 5
5) 8