Find the Coefficient a of the Term in the Expansion $( 6 x - y ) ^ { 10 }~ a x ^ { 2 } y ^ { 8 }$

Multiple Choice

Find the coefficient a of the term in the expansion of the binomial.​ Binomial Terms
$( 6 x - y ) ^ { 10 }~ a x ^ { 2 } y ^ { 8 }$ ​

A) 1,621
B) 1,620
C) 1,619
D) 1,623
E) 1,618