How many 3-digit numerals end with a digit that represents a prime number?	Select the correct option:  A) 16  B) 80  C) 160  D) 180  E) 400
prime digits 2,3,5 and 7.   three digit numbers _ _ _   1st place can be filled in 4 ways   2nd place can be filled in 10 ways   3rd place can be filled in 10 ways   Total=4*10*10= 
<gadget id="calculator">4*10*10</gadget>
<output>400</output>
400   Ans : 400
<result>E</result>
How many 3-digit numerals end with a digit that represents a prime number?