MBA Exam

How many four-digit numbers can be made by using exactly three different digits among the digits 4, 5, 6 and 7?

1) 156
2) 124
3) 132
4) 144
5) 120

Read Solution (Total 1)

144

4*3*4!/2! =144
12 years agoHelpfull: Yes(0) No(0)

MBA Other Question

Four people attended a party. Each of them brought along his ipod and kept
it on a desk when he arrived at the party. One of them got a call and
left the party in a hurry. While leaving, the person picked one of the
ipods at random and left. From the second person onwards, each person
picked his ipod, if it was there on the desk, else he picked up an ipod
at random and left. What is the probability that the last person leaving
the party will get his own ipod?(1) 5/12
(2) 13/24
(3) 1/4
(4) 1/2At least One approach

1) A
2) B
3) C
4) D
Four triangular gardening plots form a square as in the figure shown. A gardener will plant flowers so that each plot contains one kind of flower, and flowers in plots which share a common edge are different. How many choices does the gardener have if the flowers can be roses, carnations, daisies, lillies, or tulips?

1) 260
2) 280
3) 890
4) 900