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24-08-2019
Mathematics

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5. Expla in why 4 is or is not a multiplicative inverse mod 10 of 7.

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sqdancefan sqdancefan

24-08-2019

Answer:

4 is not. (3 is)

Step-by-step explanation:

A number is the multiplicative inverse of 7 (mod 10) if the product mod 10 is 1.

7 × 4 mod 10 = 28 mod 10 = 8 . . . . not 1

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