Directions: Identify which number is wrong in the given series. 7, 13, 25, 51,…

Pattern: Each term equals 2 × (previous term) − 1.

• Check 1: 13 = 2 × 7 − 1 = 13 (correct).

• Check 2: 25 = 2 × 13 − 1 = 25 (correct).

• Check 3: Expected next = 2 × 25 − 1 = 49, but the given term is 51, which does not match (51 ≠ 49).

• Check 4 (with corrected value): 97 = 2 × 49 − 1 = 97 (consistent).

Conclusion: 51 is the wrong number. The corrected sequence is 7, 13, 25, 49, 97.