- AS
- BV
- CU
- DT
Step-by-Step Solution
Gaps grow by 2, 3, 4, 5: A(1), C(3), F(6), J(10), O(15), so add 6 to reach position 21 = U.
Answer: C) U
Find the next term in the letter series: A, C, F, J, O, ?
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