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Q:

From a group of 7 boys and 6 girls, five persons are to be selected to form a team, so that at least 3 girls are there in the team. In how many ways can it be done?

A) 427	B) 531
C) 651	D) 714

Answer & Explanation Answer: B) 531

Explanation:

Given in the question that, there are 7 boys and 6 girls.

Team members = 5

Now, required number of ways in which a team of 5 having atleast 3 girls in the team =

$(6 C_{3} x 7 C_{2}) + (6 C_{4} x 7 C_{1}) + (6 C_{5}) = [\frac{6 x 5 x 4}{3 x 2 x 1} x \frac{7 x 6}{2 x 1}] + [\frac{6 x 5 x 4 x 3}{4 x 3 x 2 x 1} x 7] + [\frac{6 x 5 x 4 x 3 x 2}{5 x 4 x 3 x 2 x 1}] = 420 + 105 + 6 = 531 .$

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Filed Under: Permutations and Combinations
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Q:

What gets broken without being held?

Answer

Yes, a promise can be broken without being held.

Workspace

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Subject: Word Puzzles Exam Prep: AIEEE , Bank Exams , CAT , GRE , TOEFL
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Q:

Sound travels fastest in

A) Vacuum	B) Air
C) Glass	D) Water

Answer & Explanation Answer: C) Glass

Explanation:

Sound is a mechanical vibration and needs a medium for propagation. The higher the density of the medium, the faster the sound travels. So, sound cannot travel through vacuum.

As the sound travels faster in solids than liquids and gases, sound travels faster in the glass than Air and water.

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Filed Under: Physics
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Q:

Main storage is also called

A) Memory	B) Control unit
C) Accumulator	D) Register unit

Answer & Explanation Answer: A) Memory

Explanation:

In a computer, the area where the data is stored for the quick access by the computer's processor is called Main storage or Primary storage or Memory or RAM.

Hence, main storage is also called Memory.

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Filed Under: Computer
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Q:

Which structural formula represents a dipole?

dipole1526886238.jpg image

A) 4	B) 3
C) 2	D) 1

Answer & Explanation Answer: D) 1

Explanation:

What is Dipole :

when two atoms in a molecule have substantially different electronegativity: One atom attracts electrons more than another, becoming more negative, while the other atom becomes more positive.

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Filed Under: Chemistry
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Q:

Sukhna Lake is in which city?

A) Jaipur	B) Chandigarh
C) Hyderabad	D) Pune

Answer & Explanation Answer: B) Chandigarh

Explanation:

Sukhna Lake is in Chandigarh, India.

It is a reservoir at the foothills of the Himalayas. It covers an area of 3 km². This rainfed lake was created in 1958 by damming the Sukhna Choe, a seasonal stream coming down from the Shivalik Hills.

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Filed Under: Indian Geography
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Q:

Maximum age limit of President of India

A) 30	B) 35
C) 45	D) None of the above

Answer & Explanation Answer: D) None of the above

Explanation:

There is no maximum age limit for the President of India. Minimum age limit for president of India is 35 years.

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Filed Under: Indian Politics
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Q:

India is the largest producer of

A) Apples	B) Grapes
C) Oranges	D) Bananas

Answer & Explanation Answer: D) Bananas

Explanation:

India is the World's largest producer of Bananas producing nearly 30 million tons a year.

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Filed Under: Indian Geography
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