Question

$2^{1} +2^{2}+.........+2^{99}$ SA SE DIVIDA PRIN 7!PLSSS REPEDE

Answer 1

2(1 + 2 + 2² +2³ +..........+ 2⁹⁸) = 2[(1+2+2²) + 2³ (1+2+2²)+......+2⁹⁶(1+2+2²)] = 2ₓ7(1 + 2³+........+2⁹⁶) = divizibil cu 7