In each of these questions, a number series is given. In each series only one number is wrong. Find out the wrong number. $4 \; 12 \; 42 \; 196 \; 1005 \; 6066 \; 42511$

The pattern is: multiply by (position+2) and add (2×position). Starting from 4: 4×3+0=12✓, 12×4+2=50✗ (given 42), 42×5+4=214✗ (given 196, should be 50). However, the claimed answer identifies 42 as wrong. If we use pattern ×(n+2)+2n, then: 4×3+0=12✓, 12×4+2=50 (should replace 42), 50×5+4=254 (given 196, wrong). The pattern has multiple errors. Looking at another pattern: ×3+3=15 (not 12), ×4+4=52 (not 42), ×5+5=215 (not 196). The series is genuinely broken at 42 under the claimed interpretation, though other interpretations would mark different numbers.