A series is given with one term wrong. Select that wrong term from the given alternatives. PQ707, MM587, LI469, JE350, HA231, FW112

Letters decrease by 3 and 4 alternately, numbers decrease by 120, 119, 118... The correct sequence gives MM587 should be MM577 (707−120=587 but checking letter pattern: P→M is −3, Q→M is −4? P(16)→M(13)=−3, Q(17)→M(13)=−4; next L(12)=M−1? No: M(13)→L=−1 not −3). Re-examining: numbers 707,587,469,350,231,112 — differences are 120,118,119,119,119 — 587 should be 589 (707−118) making MM587 wrong, it should be MM589.