Latest TCS Aptitude Question SOLUTION: bag has 1,3,5,7,9,11 and 13 cm sticks .find the probablity that they they will form a triangle if 3 sticks are drawn?

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(#M40030015) TCS question Keep an EYE

bag has 1,3,5,7,9,11 and 13 cm sticks .find the probablity that they they will form a triangle if 3 sticks are drawn?

Asked In TCS pre (11 years ago)

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Anirudh Saxena  (11 years ago)

Ans is 13/35
Total way of selecting=7C3=35
Now selections that are in fever=(3,5,7),(3,7,9),(3,9,11),(3,11,13),(5,7,9),(5,7,11),(5,9,11),(5,9,13),(5,11,13),(7,9,11),(7,9,13),(7,11,13),(9,11,13)=total 13.
Others are rejected because to form a triangle it is neccessary that the sum of 2 small sides must be greater than the third greatest side

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Chandan Kumar Nayak  (11 years ago)

sry 4 the mistake guyz .... the sample space = 7c3 =35 & favourable events= 13
so probability= 13/35

Is this solution Helpfull? Yes (4) | No (3)  

Chandan Kumar Nayak  (11 years ago)

Events={ (3,5,7),(3,7,9),(5,7,9),(9,3,11),(5,7,11),(9,5,11),(11,9,13),(11,7,13),(11,5,13),(11,3,13),(9,7,13),(9,5,13) } =12
Sample space = 6c3=20
Probability = 12/20
=3/5 (ans)

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Chandan Kumar Nayak  (11 years ago)

12/6c3
= 12/20
= 3/5

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Vijendra Kumar Rana  (11 years ago)

events=8
sample space=20
p=2/5

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