The number of ways in which 10 candidates \( A_{1}, A_{2} \),
.... \( A_{10} \) can be ranked so....
The number of ways in which 10 candidates \( A_{1}, A_{2} \),
\( \mathrm{P} \)
.... \( A_{10} \) can be ranked so that \( A_{1} \) is always above \( A_{2} \) is
W
(1) \( \frac{10 \text { ! }}{2} \)
(2) \( 2^{7} 3^{4} 5^{2} 7^{1} \)
(3) \( 2^{8} 5^{2} \)
(4) \( 3^{4} 5^{2} 7 \)
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