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Q.

From a group of 50 students, two sections comprising of 20 and 30 students are formed. If Ram and Rahim are two particular students among the 50 students, then the probability that they both belong to the same section is 

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a

2549

b

1323

c

2449

d

1223

answer is A.

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Detailed Solution

n(S)=C2  50

E=Ram and Rahim both are same section

n(E)=C2  20+C2  30P(E)=C2+C2  30  20C2  50

20×19+30×2950×49=38+87245=125245=2549

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