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how many 4 digit password is possible using a standard phone's keypad if the first digit cannot be 0 and no digit may be used more then once​

please help me

c⁴1992 please help mee

Sagot :

Answer:

3024

Step-by-step explanation:

so only available numbers are 1 2 3 4 5 6 7 8 and 9

no 0 also 10 because only keypad

so the solution here is

9×8×7×6

and you get 3024

why 3024

first is 9 because we have 9 numbers

no repitition so now its 8

7

6

except the others

im just a grade 8 student and only learned this from yt

correct if im wrong