Answer
a) 4
b) 16
c) 64
d) 256
Work Step by Step
The possible sequences number for four different nucleotides is 4$^{n}$, where n = the number of sequence nucleotides.
a) 4$^{1}$ = 4
b) 4$^{2}$ = 16
c) 4$^{3}$ = 64
d) 4$^{4}$ = 256
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