A female 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 option
A) 100 B) 120 C) 140 D) 110 E) 150
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 = 10C3 = 120   ans = 120-10= 
<gadget id="calculator">120-10</gadget>
<output>110</output>
110   110
<result>D</result>
A female 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?