Pick out the odd one out from the following series 10, 12, 28, 90, 368, 1840,…

Concept: In a “find the wrong number in the series” question, consecutive terms follow one fixed algebraic rule of the form next term = previous term × (an increasing multiplier) + (an increasing additive constant), where the multiplier and the constant each step up by a fixed amount from one pair of terms to the next. To find the wrong term, derive this rule from several consistent consecutive terms, then test every term against it — the term that breaks the pattern is the wrong number.

1. First term (10) to second term (12): 10 × 1 + 2 = 12 ✓

2. Second term (12) to third term (28): 12 × 2 + 4 = 28 ✓

3. Third term (28) to fourth term (90): 28 × 3 + 6 = 90 ✓

4. Fourth term (90) to fifth term (368): 90 × 4 + 8 = 368 ✓

5. Fifth term (368) to the sixth term: 368 × 5 + 10 = 1850 is required, but the series shows 1840 — the pattern breaks here.

6. Correct sixth term (1850) to the seventh term (11112): 1850 × 6 + 12 = 11112 ✓ (this confirms the sixth term must be 1850, not 1840).

Cross-check: the seventh term (11112) is consistent only if the sixth term equals 1850 (368 × 5 + 10), which independently confirms that 1840 is the term that breaks the pattern.

Hence, the wrong number in the series is 1840 (it should be 1850).