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Solving for 'e' easy question

Just need a quick answer of how my tutor got ‘e’ to = 0 from this equation. (im trying to find the identity of a binary operation) 38 more words

trying to find associativity

Is the binary operation define by:
$x*Y = x+y-1$

what my tutor has done:
$x*(y*z) = x *(y+z -1) = x+(y+z-1) = x+y+z-2$

My question: 39 more words

Learning question: to find whether a function is injective

Let F: z -> z such that:

f(n)= $\lfloor(1-6n)/3\rfloor$

To find injectivity i did:

suppose $f(n_1) = f(n_2)$

therefore $\lfloor(1-6n_1)/3\rfloor$ = $\lfloor(1-6n_2)/3\rfloor$

therefore $\lfloor(-6n_1)/3\rfloor$ = $\lfloor(-6n_2)/3\rfloor$ 104 more words

How can i learn when to use which multiplication rule: Probability

Hey guys im studying for a math exam and was wondering if anyone has some easy techniques to remember in what kind of scenario to use these equations. 123 more words

Learning question: to find whether a function is injective

Let F: z -> z such that:

f(n)= $|__ (1-6n)/3_|$

To find injectivity i did:

suppose f(n1) = f(n2)

therefore $|__(1-6n1)/3_|$ = $|__(1-6n2)/3_|$

therefore $|__(-6n1)/3_|$ = $|__(-6n2)/3_|$ 102 more words

How can i learn when to use which multiplication rule: Probability

Hey guys im studying for a math exam and was wondering if anyone has some easy techniques to remember in what kind of scenario to use these equations. 123 more words

Combinations permutation simple

I am trying to study an im not quite sure how

5 choose 3 and 7 choose 3 = 350

from my understanding the formula is… 30 more words