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Full explanation of the variation by solving an exercise without repetition and another with repetition: With the numbers 1, 2, 3, 4, 5, 6 and 7, how many 3-digit numbers... In how many ways can you elect the president and vice president... Complete course on Combinations, Permutations and Variations: • Combinations, Permutations and Variations... _________________________________________________________________ If you want to help me so that the channel continues to grow you can: Subscribe: https://www.youtube.com/matematicaspr... Contribute to the channel with a donation: https://www.paypal.me/profeAlex Become a member of the channel: https://www.youtube.com/matematicaspr... _________________________________________________________________ Download my MathAlex app: http://onelink.to/vmcu3e Visit my website: https://www.MatematicasProfeAlex.com Follow me on my social networks: Facebook: / matematicasprofealex Instagram: / matematicasprofealex Contact Only business, press: [email protected] 0:00 Greeting 0:22 Concepts you should know 1:48 Solution of the example 11:50 Solution of example 2 16:18 Practice exercise