If the multiplicative inverse of “53 modulo 21” exists, then whic – McqOptions

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1.	If the multiplicative inverse of “53 modulo 21” exists, then which of the following is true?
A.	GCD(53,21) = 1
B.	GCD(53,21) = 29
C.	GCD(53,21) = 53
D.	GCD(53,21) = 12
Answer» B. GCD(53,21) = 29

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