Question 150

A1A, B2B, C3F, D4X,?

The first letter is moving by one letter. And the number is indicating the position in alphabetical order. The third letter is same as the first letter for the first terms. 

Let's write the alphabetical positions.

1, 2, 6, 24 $$\Rightarrow$$ this is the factorial of the numbers. So, for the next term the third term will be 5! = 120.

120%26 = 16(P)

E5P will be the fifth term.

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