To demonstrate that 7 is a Mersenne prime, Ogechi should use the expression 2^3 - 1.
A Mersenne prime is a prime number of the form 2^n - 1, where n is a positive integer. In this case, n is equal to 3 (since 7 is 2 raised to the power of 3 minus 1). By finding that the expression evaluates to a prime number (7), Ogechi can show that 7 is indeed a Mersenne prime.
Ogechi is trying to demonstrate that 7 is a Mersenne prime. Which of the following expressions should she use
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