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Cake day: June 30th, 2023

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  • kuneho@lemmy.worldtoMemes@lemmy.ml6÷2(1+2)
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    1 year ago

    I Looked up doing factorials and n! = n(n – 1) is used interchangeably with n! = n*(n – 1)

    yeah, the way I have been taught is that either you put the multiplication sign there or not, it’s the exact same, there’s absolutely no difference in n(n-1) and n*(n-1). in the end, you treat it like the * sign is there and it’s just matter of convenience you can leave it off.


  • kuneho@lemmy.worldtoMemes@lemmy.ml6÷2(1+2)
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    1 year ago

    isn’t that division sign I only saw Americans use written like this (÷) means it’s a fraction? so it’s 6÷2, since the divisor (or what is it called in english, the bottom half of the fraction) isn’t in parenthesis, so it would be foolish to put the whole 2(1+2) down there, there’s no reason for that.

    so it’s (6/2)*(1+2) which is 3*3 = 9.

    the other way around would be 6÷(2(1+2)) if the whole expression is in the divisor and than that’s 1.

    tho I’m not really proficient in math, I have eventually failed it in university, but if I remember my teachers correctly, this should be the way. but again, where I live, we never use the ÷ sign, only in elementary school where we divide on paper. instead we use the fraction form, and with that, these kind of seemingly ambiguous expressions doesn’t exist.