text: what are the purmutations and combinations  for selection of six nos from any 19 nos? suppose the numbers are like abcdefghijklmnopqrstu and i want any six to be selected at a time from above 19 nos please send all the combinations. since it is a selection it will be a combination a permutation is actually arrangement its important to know the difference there will be 19c6 combintaions  i.e 19!/6!*13! (!=factorial)  the answer after calculation will be  27132 hope it was some help