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Q.

Let set  S={a1,a2,a3,,a12}  where all twelve elements are distinct, we want to form sets  each of which contains one or more of the elements of set  S  (including the possibility of  using all the elements of S). The only restriction is that the subscript of each element in a  specific set must be an integral multiple of the smallest subscript in the set. For example,  {a2,a6,a8}   is one acceptable set. Number of such sets can be formed, is K. Where sum of the digits K is …..
 

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answer is 5.

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Detailed Solution

So, the total number of acceptable sets according to the condition is
  
211+25+23+22+21+21+6 =2048+32+8+4+2+2+6=2102

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