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Question

If a six digit pass-code must have a 1 or 5 in the 1st place and a 1 or 5 in the last place but 1 & 5 are not

allowed in any other position, (example: 100235, 539781, 103471 etc.) how many possible pass-codes can be generated?

Top Answer

The 1st position can be filled in any two ways by 1 or 5, so no of possible ways to fill the 1st position is = 2 For each of... View the full answer

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