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Q) Write 4 digit number with no digit repeated.Plz explain each step with easy understanding theory |
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Answer» Make 4 boxed place 9 in first ,9 in 2nd,8 in 3rd and 7 in 4th box and now multiply all I.e 9×9×8×7 you Wii get your answer Box methodStep1- draw four boxes.Step2-1000 th places can be filled by 9way$ remaining places can be filled by 9p3 way. |
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