The probability of inviting three of your friends on 5 consecutive days, exactly one friend a day and no friend is invited on more than two days is

A man has 7 friends. In how many ways can be invite one or more of them to a party ?

of day-to-day income and expenditure was more than

A man has three friends.The number of ways he can invite one friend everyday for dinner on six successive nights so that no friend is invited more than three xx is a.640 b.320 c.420 d.510

Mohan has 8 friends, in how many ways he invite one or more of them to dinner?

Ramesh has 6 friends. In how many ways can he invite one or more of them at a dinner

A man has 10 friends, in how many ways he can invite one or more of them to a party?