Raial has 7 different posters to be hanged in her bedroom...
Raial has 7 different posters to be hanged in her bedroom, living room and kitchen. Assuming she has plans to place at least a poster in each of the 3 rooms, how many choices does she have?
49
170
21
210
Correct answer is D
The first poster has 7 ways to be arranges, the second poster can be arranged in 6 ways and the third poster in 5 ways.
= 7 x 6 x 5
= 210 ways
or 7P3 = 7!(7−3)! = 7!4!
= 7×6×5×4!4!
= 210 ways
Determine the area of the region bounded by y = 2x2 + 10 and Y = 4x+16....
The angle of a sector of a circle of diameter 8cm is 135°. Find the area of the sector [Take \(\...
In the figure, If PT is parallel to RS, PQ = PT, and angle SQT = 90o, Find x...
Which of the following is not a property of all parallelogram? ...
What must be added to b2-3ab to make it a perfect square?...
A sector of a circle of radius 9cm subtends angle 120° at the centre of the circle. Find the are...
A trader makes a loss of 15% when selling an article. Find the ratio, selling price : cost price ...