Which of the following has 21^20 as a factor?
Choose the correct choice
A) 15^60	B) 30^20	C) 40^80	D) 42^20	E) 90^80
Here 21^20 = 3^20 * 7^20 Only Option D has both .   Smash 42^20
<result>D</result>
Which of the following has 21^20 as a factor?