Hi,

ways by which a president’s wife can invite at least two from 8 cabinet members’ wives to a tea party.

 8C2 + 8C3 + 8C4 + 8C5 + 8C6 + 8C7 + 8C8

  28 + 56 + 70 + 56 + 28 + 8 + 1 

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