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Chelsea has 5 roses and 2 jasmines. A bouquet of 3 flowers i

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Chelsea has 5 roses and 2 jasmines. A bouquet of 3 flowers i [#permalink] New post   14 May 2019, 00:29
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Chelsea has 5 roses and 2 jasmines. A bouquet of 3 flowers is to be formed. In how many ways can it be formed if at least one jasmine must be in the bouquet?

(A) 5

(B) 20

(C) 25

(D) 35

(E) 40
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Re: Chelsea has 5 roses and 2 jasmines. A bouquet of 3 flowers i [#permalink] New post   12 Aug 2019, 04:57
need explanation?
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pranab223
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Re: Chelsea has 5 roses and 2 jasmines. A bouquet of 3 flowers i [#permalink] New post   12 Aug 2019, 07:34
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Carcass wrote:
Chelsea has 5 roses and 2 jasmines. A bouquet of 3 flowers is to be formed. In how many ways can it be formed if at least one jasmine must be in the bouquet?

(A) 5

(B) 20

(C) 25

(D) 35

(E) 40


Here,
Let us consider the possibilities::

CASE I
1 rose and 2 jasmines which can be arranged in = 5C1 * 2C2 = 5

CASE II
2 roses and 1 jasmines which can be arranged in = 5C2 * 2C1 = 20

Therefore the total no. of possibilities = 20 + 5 = 25
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Re: Chelsea has 5 roses and 2 jasmines. A bouquet of 3 flowers i [#permalink] New post   28 Aug 2019, 01:00
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pranab01 wrote:
Carcass wrote:
Chelsea has 5 roses and 2 jasmines. A bouquet of 3 flowers is to be formed. In how many ways can it be formed if at least one jasmine must be in the bouquet?

(A) 5

(B) 20

(C) 25

(D) 35

(E) 40


Here,
Let us consider the possibilities::

CASE I
1 rose and 2 jasmines which can be arranged in = 5C1 * 2C2 = 20

CASE II
2 roses and 1 jasmines which can be arranged in = 5C2 * 2C1 = 5

Therefore the total no. of possibilities = 20 + 5 = 25


I think you got the calculations mixed up. 5C2 * 2C1 = 20 etc.
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gmatclubot
Re: Chelsea has 5 roses and 2 jasmines. A bouquet of 3 flowers i [#permalink]
28 Aug 2019, 01:00
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