A double decked bus can accommodate 100 passengers 40 in the upoer deack and 60 in the lower deck . In how many ways can a group of 100 passengers be accommodated is 15 refuse to sit in the lower deck and 20 refuse to sit in the upper deck ?

A double-decker bus carry (u+l) passengers,u in the upper deck and l in the lower deck. Find the number of ways in which the u+l passengers can be distributed in the two decks,if r(<=l) particular passengers refuse to go in the upper deck and s(<=u) refuse to sit in the lower deck.

A double-decker bus carry (u+e) passengers, u in the upper deck and e in the lower deck. Find the number of ways in which the u+e passengers can be distributed in the two decks, if r(lt=e) particular passengers refuse to go in the upper deck and s(lt=u) refuse to sit in the lower deck.

A double decker bus has 15 seats in the lower deck and 13 seats in the upper deck. In how many ways can a marriage party of 28 persons be arranged if 4 old people refuse to go to the upper deck and 4 children wish to travel in the upper deck only.

A double decker minibus has 13 seats in the lower deck and 12 seats in the upper deck. In how many ways can a marriage party of 25 persons be arranged if 4 old people refuse to go to the upper deck and 3 children wish to travel only in the upper deck.

Passengers are to travel by a double decked bus which can accommodate 13 in the upper deck and 7 in the lower deck.The number of ways that they can be divided if 5 refuse to sit in the upper deck and 8refuse to sit in the lower deck,is

Passengers are to travel by a double decked bus which can accommodate 13 in the upper deck and 7 in the lower deck. Find the number of ways that they can be distributed if 5 refuse to sit in the upper deck and 8 refuse to sit in the lower deck.