Latest CTS Aptitude Question SOLUTION: Out of forty students, there are 14 who are taking Physics and 29 who are taking Calculus. What is the probability that a randomly chosen student from this group is taking only the

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Out of forty students, there are 14 who are taking Physics and 29 who are taking Calculus. What is the probability that a randomly chosen student from this group is taking only the Calculus class?

Asked In CTS Kuldeep Singh (12 years ago)

Solved Vasu Read Solution (5)

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Read Solution (5) :

Vasu  (12 years ago)

Out of forty students, there are 14 who are taking Physics and 29 who are taking Calculus.
it means 3 students are taking both subjects.
29-3=26 are taking calculus only.
probability that a randomly chosen student from this group is taking only the Calculus class = 26/40 = 13/20

Is this solution Helpfull? Yes (54) | No (2)  

M M Reza  (12 years ago)

29 students take Calculus.
40 - 29 = 11 do not take Calculus.
14 take Physics.
14-11(take only Physics) = 3 take both.
29-3 = 26 take only calculus.
Thus, Probability of only Calculus student = 26/40 = 13/20

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Jai  (12 years ago)

STUDENTS TAKING
ONLY PHYSICS = 11
ONLY CALCULUS = 26
BOTH = 3

PROB(ONLY CAL) = 26/40 = 13/20 = 0.65 = 65%

Is this solution Helpfull? Yes (8) | No (2)  

Shanky Chauhan  (12 years ago)

(F+x1+x2+x3+x4+x5+W)/6=A
after 10 years
(c+x1+10+x2+10+x3+10+x4+10+x5+10+W+10)/6=A
take C=0 for child ..solve the upper 2 equations..
i.e F=50 for present age of father=F+10=60

Is this solution Helpfull? Yes (2) | No (8)  

vijay  (8 years ago)

ans=26/40
sol:total there are 40 students (t)
so p intersection c is =(p+c)-t
=(14+29)-40 = 3
so students only studying calculus are 29-3=26
so probability = 26/40

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