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1. |
Find the probability that getting 4 digit number with 1 in the unit place and 2 in the tens place when the numbers 1, 2, 3, 4 and 5 are arranged at random without repeating. |
A. | $\frac{{1}}{{5}}$$ |
B. | $\frac{{1}}{{10}}$$ |
C. | $\frac{{1}}{{15}}$$ |
D. | $\frac{{1}}{{20}}$$ |
Answer» E. | |