An intelligence agency decides on a code of 2 digits selected from 0, 1, 2, …, 9. but on the slip on which the code is hand written allows confusion between top and bottom, because there are indistinguishable. thus, for example, the code 91 could be confused with 16. how many codes are there such that there is no possibility of any confusion?
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M not sure... But I think that I may be 82
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Answer:
80
Step-by-step explanation:
The digits which can create confusion in top & bottom are 0, 1, 6, 8, 9.
Total two-digit confusing codes = 5 × 5 = 25.
But 00, 11, 88, 69, 96 don’t change their value in both the cases.
So, these five do not come in the category of confusing code.
Total confusing code number = 25 – 5 = 20.
Total non – confusing code of two digits = 100 – 20 = 80.
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