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A couple has two children, (i)    Find the probability that both children are males, if it is known that at least one of the children is male. (ii)   Find the probability that both children are females, if it is known that the elder child is a female.

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एक जोड़े के दो बच्चे होते हैं, (i) संभावना है कि दोनों बच्चे नर हैं, अगर यह ज्ञात है कि कम से कम एक बच्चे पुरुष है। (ii) संभावना है कि दोनों बच्चे मादा हैं, अगर यह ज्ञात है कि बड़ा बच्चा मादा है।

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