Exercise
6.1
1.
Suppose, you have two shorts, one is black and the other one is blue; three shirts
which are in white, blue and red. You again wish to make different combinations,
but you always want to make sure that the shorts and shirt that you wear are of
different colours. List and check how many combinations are possible now.
Answer:
No. of shorts − 2 −−−−−−−−
No. of shirts − 3
Blue − 1; Black − 1 −−−−−−− Blue − 1 ; white−1 ; red − 1
Different combinations −> different in combinations.
Short
Blue, Blue, Black
Black, Black, Blue
Shirt
White, Red, Blue
White, Red, Blue
Answer: ‘6’ combinations
2.
You have two red and two blue blocks. How many different towers can you build that
are four blocks high using these blocks? List all the possibilities.
Answer:
Blocks − Red − 2 − Blue – 2
Possible towers
1. R R B B
2. R B R B
3. B R B R
4. B R R B
5. B B R R
6. R B B R
Answer: ‘6’ possibilities.
Answers:
Exercise 6.1
(1) 6 combinations are possible,
Black − White ; Black − Blue
; Black − Red
Blue − white ; Blue −
Blue ; Blue − Red
(2) 6 possibilities,
R-B-R-B R-R-B-B B-R-R-B
B-R-B-R B-B-R-R R-B-B-R
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