Answer:
Clock...
Step-by-step explanation:
Answer:
Area of semicircle is

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The formula for C(n,r), also known as "n choose r" or a combination,
is:
nCr = n! / (r!(n-r)!),
where n is the total number of options and r is number you must choose
The number generated is the total number of possible combinations.
The ! means factorial. For example, 4! = 4 x 3 x 2 x 1
Answer:
- 15 and -10
Step-by-step explanation:
13/99 can't be simplified any further, because 13 is a prime number, meaning that 13 has only 2 factors 1 and itself.