elitmus Exam undefined

Q. let 'n' be non prime no such that.. 1

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elitmus Other Question

Q. There are 5 couple out of which we have to form a 3 member committee so that no couple will be together

Option
a)110
b)120
don't know the other two.... Did anyone solve the question which was like

Q. z=y^o+y^1+.....+Y^n
and if the equation is divided by 6...dont remember the question exactly...