The correct answer is A
15, 31, 67, 131, ?, 375
728, 737, ?, 778, 814, 863
31, 60, 118, 234, 466, ?
21, ?, 93, 156, 237, 336
21 11 12 19.5 41 ? 318
16 25 36 49 64 ?
17 , 37 , 79 , 165 , ? , 689
12, 25, 51, ?, 207, 415
252, 128, 66, 35, 19.5, ?
Choose the missing term.
R, U, X, A, D,?
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