a man has 3 friends. the no of ways in which he can invite each friend everyday for a dinner on 6 successive night so that h invites each friend atleast once is N. which of the following holds good.
a)no od divisors of N which are divisible by 5 is 12.
b)sum of all divisors of N is 1680
c)no of ways in which N can be resolved as product of two divisors which are reltively prime is 4.
d)no of divisors of the form (4n+2),n belongs to N is 6
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