There are cloth pieces of five different
colours. A signal is generated by
combining cloth pieces of two different
colours. How many signals can be
generated?
(a) 10
(b) 15
(c) 20
(d) 25
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0
Answer:
10
Step-by-step explanation:
5 colours
let they be a,b,c,d,e
A combination should contain two of them therefore
ab
ac
ad
ae
bc
bd
be
cd
ce
de
these are the combinations
total 10 of them
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