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Mathematics 21 Online
OpenStudy (anonymous):

A code consists of two letters (they can be repeated) followed by one digit (0-9). The number of possibilities is

OpenStudy (lucaz):

(# letters)*(# letters)*10

OpenStudy (anonymous):

is the sum 40 @lucaz

OpenStudy (lucaz):

it depends on how many letters you're counting

OpenStudy (anonymous):

it just sais theres the code consists of 2 letters

OpenStudy (anonymous):

\[a^b *c\] where a is the number of options for each letter (26 in the alphabet) b is the number of letters (you have 2) c is the number of number digit possibilities (10) so the answer is 6760

OpenStudy (lucaz):

let's say you're alphabet has only 5 letters, the number possibilities would be 5*5*10=250 (10 from the 0 to 9)

OpenStudy (anonymous):

simple test, if your alphabet was just x,y,z the 'a' value i mentioned is 3 the 'b' value is still 2 and the c is still 10 from just the letters you could have xx,xy,xz,yy,yx,yz,zz,zy,zx (this is 9 options) and for each of these they have one of 10 number digits attached so for the above 9 options there are 10 options for each xx => xx0,xx1,xx2......xx9 so its (9 options * 10) = 90. the same as \[3^2 * 10\]

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