at a mobile shop 2 samsung, 3 apple and 2 nokia phones are on display. 2 phones are bought on random basis
Answers
Given : at a mobile shop 2 samsung, 3 apple and 2 nokia phones are on display.
2 phones are bought on random basis
To Find : Probability of all the possible cases
Solution
Samsung = 2
Apple = 3
Nokia = 2
Total = 7
Total Ways of selecting 2 mobiles = ⁷C₂ = 21
Ways Probability
Both Samsung Mobile = ²C₂ = 1 1/21
Both Apple Mobile = ³C₂ = 3 3/21 = 1/7
Both Nokia Mobile = ²C₂ = 1 1/21
one Samsung one Apple ²C₁.³C₁ = 6 6/21 = 2/7
one Samsung one Nokia ²C₁.²C₁ = 4 4/21
one Nokia one Apple ²C₁.³C₁ = 6 6/21 = 2/7
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