AP EAMCET · Maths · Probability
A bag contains blue and an unknown number of red balls. Two balls are drawn at random. If the probability of both of them being blue is then the value of is equal to
- A
- B
- C
- D
Answer & Solution
Correct Answer
(C)
Step-by-step Solution
Detailed explanation
P=5C25+xC2=514 ⇒10×2(5+x)(4+x)=514 ⇒x2+20+9x=14×4 ⇒x2+9x-36=0 ⇒x=3, -12
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