In a certain code language, ‘JOIN’ is coded as ‘4978’ and ‘COIN’ is coded as ‘2879’. What is the code for ‘C’ in the given code language?
2
Each letter has a digit code, and the digits need not be in the same order as the letters. Compare the two words: JOIN and COIN share O, I and N.
JOIN → 4, 9, 7, 8 and COIN → 2, 8, 7, 9. The common digits are 9, 7 and 8, so these are the codes of O, I and N (in some order).
The letter left over in JOIN is J and the digit left over in 4978 is 4, so J = 4. The letter left over in COIN is C and the digit left over in 2879 is 2, so C = 2.
Check: with J = 4 and C = 2, each word uses its own extra digit once and the shared letters O, I, N use exactly the shared digits {7, 8, 9}, so the coding is consistent.
Hence, 2.
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If in a certain code, 6723 is coded as 8901, how is 2435 coded in that language?
In a certain code language, 'CHOICE' is written as '53', 'CHARGE' is written as '52', how will 'CHANCE' be written in that language?
