Use the permutation formula
nPr = (n!)/((n-r)!)
20P15 = (20!)/((20-15)!)
20P15 = (20!)/(5!)
The final answer is choice A
Dive your answer by three so 9.60/3 = 3.20 or £3.20
The measure of an angle<span> formed by a </span>secant<span> and a </span><span>tangent </span><span>drawn from a point outside the </span>circle<span> is half the the difference of the </span>intercepted arcs<span>.
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Answer:
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