Let the work ‘M’ = 8 units (LCM of 8 and 4) Efficiency of P = 8/8 = 1 units Efficiency of Q = 8/4 = 2 units Efficiency of P, Q and R = (8 × 15)/8 = 15 units per day Efficiency of R = 15 – (1 + 2) = 12 units per day Time taken by R to finish work ‘N’ = 120/12 = 10 days
Once____________ has infected a substantial number of computer systems, it generates revenue either by displaying advertisements or using "pay per clic...
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