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The market research department of a certain breakfast cereal firm interviewing 100 persons found that on a certain morning for breakfast
i. 72 had cereals, 39 had fruits, 75 had toast.
ii. 32 had fruits and cereal, 53 had cereal and toast, 26 had toast and fruits
iii. 21 had all three.
How many of those interviewed had neither cereal nor toast nor fruits?