Question

find the wrong term in series - : 7,28,63,124,215,342,511

Answer 1

$2 {}^{3} - 1 = 8 - 1 = 7 \\ 3 {}^{3} - 1 = 27 - 1 = 26 \\ 4 {}^{3} - 1 = 64 - 1 = 63 \\ 5 {}^{3} - 1 = 125 - 1 = 124 \\ 6 {}^{3} - 1 = 216 - 1 = 215 \\ 7 {}^{3} - 1 = 343 - 1 = 342 \\ 8 {}^{3} - 1 = 512 - 1 = 511$
So, wrong is 28