Of the last 41 customers at the student bookstore, 15 paid in cash, 16 used a debit card, 20 used a financial aid voucher, 4 used cash and a debit card, 8 used a debit card and a financial aid voucher, 8 used cash and a financial aid voucher, and 1 used all three.
(a) How many used none of these payment types?
(b) How many only used a debit card?
(c) How many used cash and a financial aid voucher but not a debit card?
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