Question 614397
You need to find the various combinations that don't allow repetition. That means, the order of the people in the group doesn't matter.

Look at this URL http://www.mathsisfun.com/combinatorics/combinations-permutations.html
Scroll to the bottom and see the equation is given by

n!/(r!(n-r)!)

n is 10, r is 6. so plug in and solve

10! / (6! * 4!)

{{{(10*9*8*7)/(4*3*2*1)}}}
{{{(10*3*7)}}}
{{{210}}}