SPM - Add Math - 2 Examples of Permutation

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this is the add math permutation video, in this video you will understand those permutation cases which said "start with" certain number or letter, and "end with" another number or letter. If you understand the concept, most of the cases are just very similar to this.
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In 9 mins you taught me what my school couldn't teach me in 3 months!! Add Maths CIE in 2 days, Soo helpfull!!!

furqanasif
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this is so so helpful! you've taught me so much, with all the videos. please do make more videos!

trialsofkay
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Case two :for the last digit only remain four numbers to be chosen, not five because hundredth digit already choose one and tenth digit already choose one. Hence, 1x2x4=8

mathmathician
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teacher, tis kind of question and answwr is for no repetition number right?

ahyan
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Hi sir, may I ask, if the instruction is given that, only '3' can be repeated, so how to do ?

carischong
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teacher, why larger than 350 cannot be 351?

somebody
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why need to count for the second one?not understand...

charlottewong
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why cant we solve it by 4P1×2P1×4P1...
For 4P1, the number is 3, 4, 5 and 6 while for 2P1, the number is 5 and 6 only

farahjia