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11 Apr 2020, 10:08
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H Experts, for a question on combinations and permutations, when nothing is mention about whether repetition of digits/alphabets is allowed or not, what are we supposed to assume? I have attached an example question.
Also, when the question is about codes eg lock code/employee code. Can the said code start with '0'?
Also, when the question is about codes eg lock code/employee code. Can the said code start with '0'?
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13 Apr 2020, 22:44
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Kritisood
Hi,
it will depend on the wordings. More often then not, repetition is allowed if not mentioned.
example
1) How many 3-digits number can be formed using 2, 3, 4 and 5?
2) How many codes can be made etc..
If you are selecting certain numbers out of given set.... replacement is the key
1) How many ways can you pick 2 numbers from a set of 5 different numbers with replacement...repetition allowed
2) How many ways can you pick 2 numbers from a set of 5 different numbers without replacement...repetition not allowed
As far as codes are concerned...
we are not looking for 3-digit numbers, so 0 can take the first digit for example 000, or 034 etc
20 Apr 2020, 00:55
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Kritisood
Whenever it is required to mention explicitly that repetition is allowed or not questions mention it otherwise you have to figure out from the language of the sums whether it is allowed or not.
Like in your sum a code can have repetitive digits so allowed although it is not mention explicitly.
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