Find the value of (20C18)*(20C20)
Choose the correct choice from the following choices:  A) 400  B) 380  C) 360  D) 350  E) 330
20C20 = 1   (20C2)*(20C20) = 20! * 1/18!   = 20*19*18!/18!   = 20*19*1= 
<gadget id="calculator">20*19*1</gadget>
<output>380</output>
380   ANSWER:380
<result>B</result>
Find the value of (20C18)*(20C20)