Discussion

Explanation:

In the sequence LRLTIM, the different sequences of scans allowed are as follows

1] Original sequence
2] Interchange L & R
3] Interchange of L & R and L & T
4] Interchange of L & R, L & T and I & M
5] Interchange of R & L
6] Interchange of R & L and T & I
7] Interchange of L & T
8] Interchange of L & T and I & M
9] Interchange of T & I
10] Interchange of T & I and L & R
11] Interchange of T & I and R & L
12] Interchange of I & M
13] Interchange of I & M and R & L

So 13 different sequences of scan are allowed of the original sequence is LRLTIM. 

Answer: 13

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