There are 10 boys and 15 girls in the commerce class. Three students are selected at random. Find the probability that 2 girls and 2 boys are selected.
7Â Â Â Â Â 14Â Â Â Â Â 42Â Â Â Â Â 168Â Â Â Â Â Â 840Â Â Â Â Â ?
...440                 482              526                  572                ?  Â...
120     119     ?     352      2464     2455
...3601 3602 1803 604 154 36
...112 ? 336 840 2520 8820
...8Â Â Â Â 20Â Â Â Â 36Â Â Â Â Â 56Â Â Â Â Â 80Â Â Â Â ?
32, 8, 4, ?, 3, 3.75
21 23 26 ? 39 51
...157, 159, 189, 319, ‘?’, 1 407 , 2749 Â
1 4 13 46 ? 976
...