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Que. The set {1, 2, 4, 7, 8, 11, 13, 14} is a group under multiplication modulo 15. The inverses of 4 and 7 are respectively
a. 3 and 13
b. 2 and 11
c. 4 and 13
d. 8 and 14
Answer:4 and 13
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