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Please explain and show your work so i can better understand.
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How many 5- digit numbers can be formed using the digits 1, 2, 3, 4, 5, 6, 7 if repetition of digits is not allowed?
Hel-----------lo -----------Sir-----------/Ma-----------dam----------- Â----------- -----------Tha-----------nk -----------you----------- fo-----------r y-----------our----------- in-----------ter-----------est----------- an-----------d b-----------uyi-----------ng -----------my -----------pos-----------ted----------- so-----------lut-----------ion-----------. P-----------lea-----------se -----------pin-----------g m-----------e o-----------n c-----------hat----------- I -----------am -----------onl-----------ine----------- or----------- in-----------box----------- me----------- a -----------mes-----------sag-----------e I----------- wi-----------ll -----------be -----------qui-----------ckl-----------y