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From I: Number of sons = 6, Number of daughters = 1. Hence, total children = 7. From II: Suppose number of daughters = x; So, the number of sons = 6x, We have 2 possibilities for daughters 1 or 6. So, if number of daughter = 1, and number of sons is 6. Which is 6 times and if number of daughter = 6, and number of sons is 6. Which is not 6 times. So statement I is required.
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