What is the greatest power that 7 can be raised to so that the resulting number is a factor of 21!? Choose the most appropriate option
A) 2	B) 3	C) 4	D) 5	E) 6
the number of 7s in 21!= 21/7=3..   ans 3
<result>B</result>
What is the greatest power that 7 can be raised to so that the resulting number is a factor of 21!?