Question

how many 4-digit nounbers can be formed using digits 12345 such that

•number are even
•numbers are odd
•total numbers​

Answer 1

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See the attachment

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Answer 2

Answer:

The total number of 4 digit numbers possible such that 2 and 5 are together are . Therefore, there are 360 - 72 = 288(Option C) numbers possible such that 2 and 5 don't come together. There are 6 digits in total and we have to form a 4 digit number, hence that can be done in 6p4 ways.