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## Answers

28 is the number which is the multiple of 4 and divisible by 7

**F={28,56} n(F)=2**

**If we look carefully , the set contains of all elements divisible by 4 and 7 , i.e. 4*7=28 between 17 and 61,since 28 and 56 are the only such elements, the answer is {28,56}**

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