Others Maths Puzzle Numerical Ability

five distinctnpairs of shoes are displayed.In how many ways can three shoes be selected containing a matching pair?
1) 20
2)30
3)40
4)50

Read Solution (Total 2)

5c1*8c1=40
10 years agoHelpfull: Yes(2) No(0)

5*5C3=5*(5*4)/2 =50
10 years agoHelpfull: Yes(0) No(1)

Others Other Question

In a horse race, the horse A's chances of winning are 1/6, the horse B's chances are 1/10 and those of the horse c are 1/8. If the race starts with twelve horses and only one horse wins, then what are the chances that one of these three horses will win?
(a)57/120 (b) 47/120 (c) 37/120 (d) 27/120 the numberbof possible integers not grater thn 99 which are not divisible by 2,3,or 5 is
(a) 73
(b) 29
(c) 26
(d) none