Discussion
Give the next in the series. A9B, C49D, E121F,....
Answer: D
The next term is G225H.
The letters are consecutive pairs: A B, C D, E F, so the next pair is G and H.
The numbers are squares of numbers going up by 4: \(9 = 3^{2}\), \(49 = 7^{2}\), \(121 = 11^{2}\), so the next is \(15^{2} = 225\).
All four options start with G and end with H, so only the number decides. 199, 221 and 281 are not squares, so none of them can continue the pattern.
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