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.
Answer:
75 = 3x
solve for x= divide 3 on both sides.
75÷3 = 25
x=25
Answer:
1=1 times 2/2 1 + 2=2 times 3/2 1 +2+3=3 times 4/2 1+2+3+4=4 times 5/2 1+2+3+4+5=5 times 6/2
I think it’s -1 because with rise/run it goes down 2 and over 2 but the line is going down, so it’s negative.
Answer:
Step-by-step explanation: