Question 852789
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Hi,
'Combinations' are traditionally used for Your purposes of finding 
P(choosing 4 specific people plus  2 others from group of 31)
For ex: 31C6 represents total ways of choosing 6 people
 31C6 = *[tex \large{{31}\choose{6}}] = {{{(36!)/6!(25)!)}}}  is equal to {{{(31*30*29*28*27*26)/(6*5*4*3*2)}}}
P(choosing 4 specific people plus  2 others from group of 31) = 
P =  {{{(4C4)(27C2)/(31C6)}}} = 351/736281