A1 = 3, an + 1-an = 0, the general term formula of sequence BN satisfies anbn = - 1 ^ n Ask BN =?

A1 = 3, an + 1-an = 0, the general term formula of sequence BN satisfies anbn = - 1 ^ n Ask BN =?

a(n+1)-an=0
a(n+1)=an
And A1 = 3, the sequence {an} is a constant sequence of 3
anbn=(-1)^n
bn=(-1)^n/3