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How many two-digit numbers can be formed from the numbers 1,2,3,4 is repetirion is allowed

 

Definition of Primary Data

Primary data is data originated for the first time by the researcher through direct efforts and experience, specifically for the purpose of addressing his research problem. Also known as the first hand or raw data. Primary... (More)

Krishna Laxman
Mathematics Trainer and Educational consultant

Two digit even number :  A numbers between 10 and 99 (including both) and one's digit should be even.

In our case ,the ten's digits can be filled in 5 ways and the one's digit can be filled in 2 ways

so totally 525\cdot2 = 10 .

12,22,32,42,52Th... (More)