For calculating first and second probes it should be

1^{st} Probe – (80+0*257) mod 701 = 80

2^{nd} Probe – (80+1*257) mod 701 = 337

Thus making 337-80 = 257

No idea why have you written 256 in place of 257, I guess there was a mistake done by you though your answer was right….😅