The U.S. Census Bureau conducts a study to determine the time needed to complete the shortform. The Bureau surveys 200 people. T
1 answer:
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Answer:
Combination
Step-by-step explanation:
Here by 10C7 we actually mean,
And the formula for evaluating mCn is
Therefore
10C7 =
Where m! is called m factorial and can be evaluated as
m!= m*(m-1)*(m-2)*(m-3)*.......3*2*1
Hence
10!= 10*9*8......*3*2*1
7!= 7*8*6.....3*2*1
3!=3*2*1
With these we can evaluate
10C7
Hence the answer is D