How-many-5-digit-numbers-from-the-digits-0-1-9-have-i-Strictly-increasing-digits-ii-Strictly-increasing-or-decreasing-digits-iii-Increasing-digits-iv-Increasing-or-decreasing-digit

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Question Number 22037 by Tinkutara last updated on 10/Oct/17

$$\mathrm{How}\mathrm{many}5-\mathrm{digit}\mathrm{numbers}\mathrm{from}\mathrm{the}$$$$\mathrm{digits}\{0,1,\dots ..,9\}\mathrm{have}?$$$$\left(\mathrm{i}\right)\mathrm{Strictly}\mathrm{increasing}\mathrm{digits}$$$$\left(\mathrm{ii}\right)\mathrm{Strictly}\mathrm{increasing}\mathrm{or}\mathrm{decreasing}$$$$\mathrm{digits}$$$$\left(\mathrm{iii}\right)\mathrm{Increasing}\mathrm{digits}$$$$\left(\mathrm{iv}\right)\mathrm{Increasing}\mathrm{or}\mathrm{decreasing}\mathrm{digits}$$

Commented by Tinkutara last updated on 15/Oct/17

$$\mathrm{help}\mathrm{pls}$$

Commented by math solver last updated on 15/Oct/17

$$idontknowhowtosolvesuchquestions!$$

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