Question

Convert the following products into factorials.: $18\times 17\times .......\times 3\times 2\times 1$

Answer 1

$18\times 17\times 16\times ........\times 3\times 2\times 1$

Factorial : product of integer and less than that

$\Rightarrow 18\times 17\times 16\times ........\times 3\times 2\times 1=18!$

Hence the correct value of above expression is $18!$