How many 3-digit numerals begin with a digit that represents a odd prime and end with a digit that represents a prime number?  Options: A) 16 B) 80 C) 160 D) 120 E) 240
prime digits 2,3,5 and 7.   three digit numbers _ _ _   1st place can be filled in 3 ways   2nd place can be filled in 10 ways   3rd place can be filled in 4 ways   Total=3*10*4= 
<gadget id="calculator">3*10*4</gadget>
<output>120</output>
120   Ans : 120
<result>D</result>
How many 3-digit numerals begin with a digit that represents a odd prime and end with a digit that represents a prime number?