The students at a school assembly were divided into 4 equal groups. There were 63 students in each group. Write and solve an equ
1 answer:
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Given:
and
.
To find:
The combinations without repetition are possible if and
.
Solution:
Combination of selecting r item from total n items is:
We have and
. By using the above formula, we get
Therefore, the correct option is D.