Find the wrong term in the given series – G4T, J10R, M20P, P43N, S90L

Solution:

Identify the two letter patterns and the numeric pattern.

• First-letter pattern: G, J, M, P, S — each next first letter is 3 positions ahead in the alphabet (+3).

• Third-letter pattern: T, R, P, N, L — each next third letter is 2 positions behind in the alphabet (−2).

• Numeric pattern: Start with 4. The differences between successive numbers are 5, 11, 23, 47. These differences follow a recurrence: each next difference = 2 × previous difference + 1 (5 → 11 → 23 → 47).

Compute the numeric sequence using those differences:

• Term 1: 4

• Term 2: 4 + 5 = 9

• Term 3: 9 + 11 = 20

• Term 4: 20 + 23 = 43

• Term 5: 43 + 47 = 90

Compare with the given series G4T, J10R, M20P, P43N, S90L:

• Letters: All terms follow the letter patterns.

• Numbers: Expected sequence is 4, 9, 20, 43, 90. The second term has 10 but should be 9.

Conclusion: The wrong term is J10R (the correct form would be J9R).