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Permutations

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

 

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)

Each time a coin is tossed the two possible outcomes are heads (H) or tails (T). So with three tosses the possible outcomes are 2×2×2=82 \times 2 \times 2 = 8 outcomes. They are: HHH, HHT, HTH, HTT, THH, THT, TTH, TTT.

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