Answer :
A number x-1 that has the property that x x-1 = 1 is the multiplicative inverse of a number x. Actually multiplying by x-1 is division by x.
Explain about the Fermat's Little Theorem?
According to Fermat's small theorem, if p is a prime number, then any integer an is an integer multiple of p if and only if the number a p - an is also an integer multiple of p. (mod p). A p-1-1 is an integer multiple of p, according to Fermat's Little Theorem, in the special case where an is not divisible by p.
The computation of powers of integers modulo prime numbers is made possible by Fermat's little theorem, a key concept in elementary number theory. In applications of basic number theory, such as primality testing and public-key cryptography, it is a specific case of Euler's theorem and plays a significant role.
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