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Your supervisor provides you with a 20ng/mL of (NH4)3N solution, and asks you to make a 7-step 3-fold dilution (3-1 at each step). After you have performed the 7-step 3-fold dilution (3-1 at each step) as requested, what is the dilution factor at the final step (step 7)? (Make sure to frame it as a fraction ex: '¼')
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