A student is ranked 13th from right and 8th from left. How many students are there in totality ?	Choose the correct choice from the following choices.
A) 18 B) 19 C) 20 D) 21 E) 22
From right 13 , From left 8   Total = 13+8-1= 
<gadget id="calculator">13+8-1</gadget>
<output>20</output>
20   ANSWER:20
<result>C</result>
A student is ranked 13th from right and 8th from left. How many students are there in totality ?