Unlock The Lock
Probability
Level
1
There are four rings in a number lock of a bag.For opening the bag a definite code is required to be set.First two rings has letters of English alphabet and other two rings has numerical digits from 0 to 9.Without repetition of alphabet letter or digit how many codes can be set?
58500
58356
67600
60840
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In first two rings 26 letters of alphabet can be arranged in 26×25 ways. In last two rings digits can be arranged in 10×9 ways. Totalcodes=26×25×10×9=58500