Question 1148275
Use combination formula
C( n, r ) = n! / ( ( n-r)! * r! )
C( 6,1 ) = 6
C( 2,1 ) = 2
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C( 7,2 ) = {{{ 7! / ( 5!*2! ) }}}
C( 7,2 ) = {{{ 6*7 / 2 }}}
C( 7,2 ) = 21
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C( 3,1 ) = 3
C( 2,1 ) = 2
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{{{ 6*2*21*3 + 6*2*21*2 }}}
{{{ 6*2*21*( 3 + 2 ) }}}
{{{ 756 + 504 = 1260 }}}
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