Question

Please answer I’ll rate brainlyest

Answer 1

Answer:

The third choice is correct

Step-by-step explanation:

The given expression is

$2^n-1$

when n=7, we substitute into the formula to obtain;

$2^7-1$

Note that;

$2^7=2\times 2\times 2\times 2\times 2\times 2\times 2=128$

$2^7-1=128-1=127$

The third choice is correct