Question 1017685
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In how many ways can you select 4 delegates to attend a seminar from 4 supervisors, 3 managers, 
and 3 assistant managers if 2 of the delegates are supervisor?   
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Let me re-formulate the problem in a way how it should be formulated:

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"In how many ways can you select 4 delegates to attend a seminar from 4 supervisors, 3 managers, 
and 3 assistant managers if exactly 2 of the delegates must be supervisors?"
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Then the answer is: {{{C[4]^2}}} . {{{C[3+3]^2}}} = {{{C[4]^2}}} . {{{C[6]^2}}} = {{{(4*3)/(1*2)}}}.{{{(6*5)/(1*2)}}} = 6*15 = 90.
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