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Activity-permutations and combinations problems (view source)
Revision as of 14:17, 10 July 2014
, 14:17, 10 July 2014→formulas
Line 33:
Line 33:
=<math>\frac{8!}{6!2!}</math><br>
=<math>\frac{8!}{6!2!}</math><br>
−=<math>\frac{8x7x6x5x4x3x2x1}{(6x5x4x3x2x1x2x1)}</math><br>
+=<math>\frac{8X7X6X5X4X3X2X1}{(6X5X4X3X2X1X2X1)}</math><br>
−<math>{^{8}}C_{2}</math>=4x7<br>
+<math>{^{8}}C_{2}</math>=4X7<br>
<math>{^{8}}C_{2}</math>=28
<math>{^{8}}C_{2}</math>=28