## Tags » I Hate Math

#### 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