A bag contains 4 red cubic blocks, 3 yellow cubic blocks, . Five cubic blocks are removed randomly from the bag and arranged in line . How many arrangements are possible?
the ans is 8 .
my working is 7P5/(4! X 3!) =17.5 .
my ans is rather weird.
A bag contains 4 red cubic blocks, 3 yellow cubic blocks, . Five cubic blocks are removed randomly from the bag and arranged in line . How many arrangements are possible?
the ans is 8 .
my working is 7P5/(4! X 3!) =17.5 .
my ans is rather weird.
I make it 25.
You take 5 blocks out: they can be:
a) 4 red, 1 yellow
b) 3 red, 2 yellow
c) 2 red, 3 yellow.
There are 5 ways of arranging (a) and 10 ways each of arranging (b) and (c). I will leave it to you to do the work.