Doubt from p&c

1573048663015-871017294

Is it 2)36?

C 81 Hai kya

One letter should repeat itself. So, no. of 4 letter words= (no. of ways to choose a letter which will repeat)×(permutation of the letters) i.e. (3)×((4!)/(2!)) = 36.

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@Anuj_2020 how did you obtain 81? Can yu share the approach!

IMG_20191106_223932

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