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Question
Consider the Postal Index Number (PIN) written on the letters as follows:
604506; 604516; 604560; 604506; 604516; 604516; 604560; 604516; 604505; 604470; 604515; 604520; 604303; 604509; 604470.
How the letters can be sorted as per Postal Index Numbers?
Solution
First three digits ie 604 is common for all Postal Index Numbers.
Comparing the remaining 3 digits we get
303, 470, 505, 506, 506, 509, 510, 515, 516, 516, 516, 516, 520, 560, 560.
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