A male student must answer 7 out of 10 questions on an examination. If at least 3 of the first 5 questions must be answered, how many possible combinations of 7 questions are available to the student?  Choose the correct choice from the following answers.
A) 120	B) 140	C) 110	D) 150	E) 160
as there is ONLY one possiblity of choosing 7 out of 10, while choosing less than 3 in first five   choose 2 in first 5 and all 5 from later half..   ways = 5C2 = 10..   total ways = 101103 = 120   ans = 120-10= 
<gadget id="calculator">120-10</gadget>
<output>110</output>
110   110
<result>C</result>
A male student must answer 7 out of 10 questions on an examination. If at least 3 of the first 5 questions must be answered, how many possible combinations of 7 questions are available to the student?