How many 3-digit numerals begin with a digit that represents a prime and end with a digit that represents a odd prime number?  Choose the correct option
A) 16 B) 120 C) 160 D) 180 E) 240
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 3 ways   Total=4*10*3= 
<gadget id="calculator">4*10*3</gadget>
<output>120</output>
120   Ans : 120
<result>B</result>
How many 3-digit numerals begin with a digit that represents a prime and end with a digit that represents a odd prime number?