There are 20 boys and 15 girls are present in a class. If 5 student will chosen for a competition an at least two students must be girl?
Pick one:  A) 309128  B) 320000  C) 251230  D) 301000  E) 100009
15 girls and 20 boys. Five students needed   It is always better to subtract the total from none in case of at least one problems.   Total ways = 35C5 = 324632   Total ways without any girl = 20C5 = 15504   Hence ways in which at least one women will be present = 324632 - 15504= 
<gadget id="calculator">324632 - 15504</gadget>
<output>309_128</output>
309128   Correct option: 309128
<result>A</result>
There are 20 boys and 15 girls are present in a class. If 5 student will chosen for a competition an at least two students must be girl?