Answer: There are 15 sets of processors.
Step-by-step explanation:
Since we have given that
Number of processors in cluster A = 8
Number of processors in cluster B = 4
Total processors = 12
Number of failed processors in cluster A = 2
Number of failed processors in cluster B = 4
Total failed processors = 2+4 = 6
So, Not failed processors = 12-6 = 6
Number of copies = 2
So, Number of sets of processors can be used is given by
[tex]^6C_2\\\\=15[/tex]
Hence, there are 15 sets of processors.