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A and B can finish a work, working on alternate days, in 19 days, when A works on the first However, they can finish the work, working alternate days, in `19 5/6` days, when B works on first day. How many days does A alone take finish the work? a. `11 1/2\ d a y s` b. `15\ d a y s\ ` c. `18\ d a y s` d. `21\ d a y s`

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