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A code word of length 4 consists two distinct consonants in the English alphabet followed by two digits from 1 to 9, with repetition allowed in digits. If the number of code words so formed ending with an even digit is 432, then is equal to
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Correct option is C
.Number of code words ending with even digit=(21)(20)(9)(4)∴432k=(21)(20)(9)(4)⇒k=35.Similar Questions
The number of ways in which we can get at least 6 successive tails when a coin is tossed 10 times in a row, is
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