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Otrada [13]
3 years ago
12

Two cards are drawn from a standard deck of cards without replacement. Find the probability of drawing a heart and a club in tha

t order
Mathematics
1 answer:
aksik [14]3 years ago
6 0

Given:

Two cards are drawn from a standard deck of cards without replacement.

To find:

The probability of drawing a heart and a club in that order.

Solution:

We have,

Total number of cards = 52

Number of cards of each suit (Spade, club, diamond, heart) = 13

The probability of drawing a heart card is:

P(Heart)=\dfrac{\text{Number of heart cards}}{\text{Total number of cards}}

P(Heart)=\dfrac{13}{52}

P(Heart)=\dfrac{1}{4}

Now, the number of remaining card is 51. So, the probability of drawing a club card is:

P(club)=\dfrac{\text{Number of club cards}}{\text{Total number of remaining cards}}

P(club)=\dfrac{13}{51}

Using these probabilities, the probability of drawing a heart and a club in that order is:

P(\text{Heart and club})=P(\text{Heart})\times P(\text{Club})

P(\text{Heart and club})=\dfrac{1}{4}\times \dfrac{13}{51}

P(\text{Heart and club})=\dfrac{13}{204}

Therefore, the required probability is \dfrac{13}{204}.

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If
baherus [9]

Answer:  see proof below

<u>Step-by-step explanation:</u>

Given: cos 330 = \frac{\sqrt3}{2}

Use the Double-Angle Identity: cos 2A = 2 cos² A - 1

\text{Scratchwork:}\quad \bigg(\dfrac{\sqrt3 + 2}{2\sqrt2}\bigg)^2 = \dfrac{2\sqrt3 + 4}{8}

Proof LHS → RHS:

LHS                          cos 165

Double-Angle:        cos (2 · 165) = 2 cos² 165 - 1

                             ⇒ cos 330 = 2 cos² 165 - 1

                             ⇒ 2 cos² 165  = cos 330 + 1

Given:                        2 \cos^2 165  = \dfrac{\sqrt3}{2} + 1

                              \rightarrow 2 \cos^2 165  = \dfrac{\sqrt3}{2} + \dfrac{2}{2}

Divide by 2:               \cos^2 165  = \dfrac{\sqrt3+2}{4}

                             \rightarrow \cos^2 165  = \bigg(\dfrac{2}{2}\bigg)\dfrac{\sqrt3+2}{4}

                             \rightarrow \cos^2 165  = \dfrac{2\sqrt3+4}{8}

Square root:             \sqrt{\cos^2 165}  = \sqrt{\dfrac{4+2\sqrt3}{8}}

Scratchwork:            \cos^2 165  = \bigg(\dfrac{\sqrt3+1}{2\sqrt2}\bigg)^2

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             Since cos 165 is in the 2nd Quadrant, the sign is NEGATIVE

                             \rightarrow \cos 165  = - \dfrac{\sqrt3+1}{2\sqrt2}

LHS = RHS \checkmark

4 0
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