Alpha numeric sequence puzzle
1. How many letters are there in the sequence 4A#9D@B7C$?
A. 2
B. 3
C. 4
D. 5
C. 4
2. If the sequence is A1, D4, G7, J10, what comes next?
A. M12
B. M13
C. N13
D. L12
B. M13
3. C1, F4, I9, L16, ?
A. O25
B. N25
C. M25
D. O20
A. O25
4. If A2 = 2, D12 = 48, G30 = 210, then J56 = ?
A. 504
B. 560
C. 448
D. 616
B. 560
5. P16, N14, L12, J10, ?
A. H8
B. G8
C. I9
D. F7
A. H8
6 B2, E5, H8, K11, ?
A. N13
B. N14
C. M14
D. O15
B. N14
7. If K11 × 2 = M22, P16 × 2 = R32, then V22 × 2 = ?
A. X44
B. Y44
C. X48
D. Z46
A. X44
8. Z9, Y8, X7, W6, ?
A. V5
B. U5
C. V6
D. U4
A. V5
9. If "E5" means E is 5th letter, "J10" means J is 10th, then "T20" and "?9" follows same rule. Find ?.
A. I
B. H
C. G
D. F
A. I
10. How many symbols are present in the sequence A5@B#7C$9D%?
A. 2
B. 3
C. 4
D. 5
C. 4