A student must answer 6 out of 10 questions on an examination. If at least 3 of the first 5 questions must be answered, how many possible combinations of 6 questions are available to the student? Options
A) 150	B) 200	C) 210	D) 170	E) 180
as there is ONLY one possiblity of choosing 6 out of 10, while choosing less than 3 in first five   choose 2 in first 5 and all 4 from later half..   ways = 5C2 = 10..   total ways = 10C4 = 210   ans = 210-10= 
<gadget id="calculator">210-10</gadget>
<output>200</output>
200   200
<result>B</result>
A student must answer 6 out of 10 questions on an examination. If at least 3 of the first 5 questions must be answered, how many possible combinations of 6 questions are available to the student?