Question 94049
10!/6!4!=10*9*8*7*6*5*4*3*2*1/6*5*4*3*2*1*4*3*2*1 NOW REDUCE BY CANCELLATION
10*9*8*7/4*3*2*1 NOW CANTINUE TO CANCEL
10/2=5, 9/3=3 8/4=2 7/1=7 
THUS WE HAVE LEFT 5*3*2*7=210 ANSWER.