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A pizzeria sells small, medium, and large pizzas, and offers five diff

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A pizzeria sells small, medium, and large pizzas, and offers five diff  [#permalink]

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New post 13 May 2017, 13:25
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Question Stats:

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A pizzeria sells small, medium, and large pizzas, and offers five different toppings. Its "Three for Thursday" delivery special allows diners to order three one-topping pizzas for the price of one, but with one restriction: all three pizzas must be the same size, and the topping for each pizza must either be the same for all three pizzas or different for each pizza. How many unique orders are available with this special?

A. 25
B. 35
C. 45
D. 55
E. 75

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Re: A pizzeria sells small, medium, and large pizzas, and offers five diff  [#permalink]

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New post 13 May 2017, 19:27
Bunuel wrote:
A pizzeria sells small, medium, and large pizzas, and offers five different toppings. Its "Three for Thursday" delivery special allows diners to order three one-topping pizzas for the price of one, but with one restriction: all three pizzas must be the same size, and the topping for each pizza must either be the same for all three pizzas or different for each pizza. How many unique orders are available with this special?

A. 25
B. 35
C. 45
D. 55
E. 75


To select the size for 3 pizzas, there are \(3\) different sizes.

Now, to select the topping for each pizza, if all 3 topping are the same, there are \(5\) different selections.
If each selected topping are different, there are \(5C3=10\) different selections.
Hence, there are total \(15\) different selections.

Now, the number of unique available orders is \(3 \times 15 = 45\). The answer is C.
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Re: A pizzeria sells small, medium, and large pizzas, and offers five diff  [#permalink]

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New post 13 May 2017, 19:48
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Bunuel wrote:
A pizzeria sells small, medium, and large pizzas, and offers five different toppings. Its "Three for Thursday" delivery special allows diners to order three one-topping pizzas for the price of one, but with one restriction: all three pizzas must be the same size, and the topping for each pizza must either be the same for all three pizzas or different for each pizza. How many unique orders are available with this special?

A. 25
B. 35
C. 45
D. 55
E. 75


Total Sizes possible = 3
Total Toppings = 5

Case 1: Same size and same toppings = 3*5 = 15

Case 2: Same size and Different toppings = 3*5C3 = 3*10 = 30


Total Orders = 15+30 = 45

5C3 is the total ways to select 3 toppings out of 5 available toppings

Answer: Option C
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Re: A pizzeria sells small, medium, and large pizzas, and offers five diff  [#permalink]

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New post 13 May 2017, 19:57
Sizes of pizza available: Small, Medium, Large

Number of different topings available: 5

Condition for orders eligible for 'Three for Thursday' --> Either three pizzas having same topings or three pizzas having different topings

For one particular sized pizza we can have: 5C1 (same topping) + 5C3 (different topping) = 5 + 10 = 15 different orders

We have 3 sizes of pizzas, so number of unique orders we can have is 15 * 3 = 45

Answer: C
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Re: A pizzeria sells small, medium, and large pizzas, and offers five diff  [#permalink]

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New post 14 May 2017, 13:46
we need to establish two spots for two cases, one for pizza and one for toppings:

Choose pizza * choose same toppings: 3C1 * 5C1= \(3*5=15\)

Choose Pizza * chose different toppings:3C1 * 5C3= \(3*10=30\)

Total: 15+30=45

Correct Response: Option C
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Re: A pizzeria sells small, medium, and large pizzas, and offers five diff  [#permalink]

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New post 15 May 2017, 20:08
number of ways of selecting 3 toppings from 5 = 5C3 = 10 + number of cases when all 3 pizzas are of same type = 5

hence 10+5 = 15

number of size we can have = 3 Hence => 3*15 = 45 ways
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Re: A pizzeria sells small, medium, and large pizzas, and offers five diff  [#permalink]

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New post 18 May 2017, 19:07
1
Bunuel wrote:
A pizzeria sells small, medium, and large pizzas, and offers five different toppings. Its "Three for Thursday" delivery special allows diners to order three one-topping pizzas for the price of one, but with one restriction: all three pizzas must be the same size, and the topping for each pizza must either be the same for all three pizzas or different for each pizza. How many unique orders are available with this special?

A. 25
B. 35
C. 45
D. 55
E. 75


Let’s first determine the number of ways to have different toppings on a particular size (e.g., small) pizza.

Since there are 5 different toppings, the number of ways to select 1 same topping for each of the 3 small pizzas is 5C1 = 5. The number of ways to select 1 different topping for each of the 3 small pizzas is 5C3 = (5 x 4 x 3)/(3 x 2) = 10. Thus, the number of ways to select three 1-topping small pizzas (under the requirement) is 5 + 10 = 15.

Using the same logic, the number of ways to select three 1-topping medium pizzas will be 15 and three 1-topping large pizzas will be 15. Thus the number of ways to select three 1-topping pizzas (under the requirement) is 15 x 3 = 45.

Answer: C
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Re: A pizzeria sells small, medium, and large pizzas, and offers five diff  [#permalink]

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New post 06 Jun 2017, 08:16
dhruv solanki wrote:
Bunuel wrote:
A pizzeria sells small, medium, and large pizzas, and offers five different toppings. Its "Three for Thursday" delivery special allows diners to order three one-topping pizzas for the price of one, but with one restriction: all three pizzas must be the same size, and the topping for each pizza must either be the same for all three pizzas or different for each pizza. How many unique orders are available with this special?

A. 25
B. 35
C. 45
D. 55
E. 75



explanation???


Please read the discussion above - there are 6 solutions provided.

Hope it helps.
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Please read this: Ultimate GMAT Quantitative Megathread | All You Need for Quant | PLEASE READ AND FOLLOW: 12 Rules for Posting!!!

Resources:
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Collection of Questions:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat

DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS; 9 Devil's Dozen!!!; 10 Number Properties set., 11 New DS set.


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Re: A pizzeria sells small, medium, and large pizzas, and offers five diff  [#permalink]

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