tolong jawab no 5 dengan benar plissss

a) A={1,2,3,...}
maka, B={1,2,3,4,5,6,7}
n(B)=7 => himpunan bagian B = [tex] 2^{n} [/tex] = [tex] 2^{7} [/tex] = 128

b) B={...,-2,-1,0,1,2,...}
maka, C={-2,-1,0,1,2,3,4,5}
n(C)=8 => himpunan bagian C= [tex] 2^{8} [/tex] = 256

Semoga membantu ya^^