Multiple choice general knowledge math & puzzles

AA,DB,IC,PD.. wHAT IS THE NEXT IN THE SERIES??

  1. GE

  2. SE

  3. PE

  4. YE
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The first letters are squares: A(1^2), D(4, 2^2), I(9, 3^2), P(16, 4^2). The next is 25 (5^2), which is Y. The second letters follow the alphabet: A, B, C, D. The next is E. Combining these gives YE.

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