Cn = n+2
C2 = 2 + 2 = 4
C5 = 5 + 2 = 7
C2×C5 = 4×7 = 28
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Cn = n+2
C2 = 2 + 2 = 4
C5 = 5 + 2 = 7
C2×C5 = 4×7 = 28