The cummulative mass fraction of particles smaller than size dj for a collection of Ni particles of diameter di and mass mi (i = 1, 2, 3, ...... ) is given by

• A. <img src="/_files/images/chemical-engineering/mechanical-operations/136-492-1.png">
• B. <img src="/_files/images/chemical-engineering/mechanical-operations/136-492-2.png">
• C. <img src="/_files/images/chemical-engineering/mechanical-operations/136-492-3.png">
• D. <img src="/_files/images/chemical-engineering/mechanical-operations/136-492-4.png">