Current location - Training Enrollment Network - Mathematics courses - Cn0+cn 1+…+CNN = 2 n in mathematical combination arrangement.
Cn0+cn 1+…+CNN = 2 n in mathematical combination arrangement.
Yes, according to the basic formula (a+b) n = cn0anb0+cn1a (n-1) b1+................................................

I'm not good at playing with mathematical symbols, so I'm a little deformed (⊙ _ ⊙), but the meaning is right, please forgive me. )