serial answers correct grade description 506 B-ABBDCAC BCAABDABA 2.96 Knuth Donald CS 1535 525 ABAAADAAD DDBABDDCC 0.00 Ullman Jeffrey CS 1541 500 ABBADACDB ADABCADDB 1.85 Cohen Paul MATH 1576 520 DAACCBDDC BBBCADDDB 0.00 Katznelson Yitzhak MATH 1511 520 DBACCBDDC BBBCADDDB 1.85 Papanicolaou George AMATH 1512 511 CDBBCCBAB DABBCDCBB 1.85 Keller Joseph AMATH 1496 552 ABDABBBDA ADCCBDAAA 0.37 Karlin Samuel AMATH 287