Forgot password?New user?Sign up
Existing user?Log in
If the coefficient of a 8 b 4 c 9 d 9 a^8b^4c^9d^9 a8b4c9d9in the expansion of ( a b c + a b d + a c d + b c d ) 10 (abc+abd+acd+bcd)^{10} (abc+abd+acd+bcd)10is N N N, then what is the sum of the digits of N N Nequal to?
问题Loading...
Note Loading...
Set Loading...