A local delivery company has three packages to deliver to three different homes. if the packages are delivered at random to the three houses, how many ways are there for at least one house to get the wrong package

1. 3

2. 5

3. 3!

4. 5!

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Correct Answer :

Explanation :
No Explanation available for this question

How many natural numbers less than a lakh can be formed with the digits 0,6 and 9

1. 242

2. 243

3. 728

4. 729

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Correct Answer :

242

Explanation :
No Explanation available for this question

There are 20 couples in a party. Every person greets every person except his or her spouse. People of the same sex shake hands and those of opposite sex greet each other with a namaskar (It means bringing one's own palms together and raising them to the chest level). What is the total number of handshakes and namaskar's in the party

1. 760

2. 1140

3. 780

4. 720

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Correct Answer :

1140

Explanation :
No Explanation available for this question

In how many ways can a leap year have 53 Sundays

1. 365C7

2. 7

3. 4

4. 2

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Correct Answer :

Explanation :
No Explanation available for this question

In a certain laboratory, chemicals are identified by a colour-coding system. There are 20 different chemicals. Each one is coded with either a single colour or a unique two-colour pair. If the order of colours in the pairs does not matter, what is the minimum number of different colours needed to code all 20 chemicals with either a single colour or a unique pair of colours

1. 7

2. 6

3. 5

4. 8

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Explanation :
No Explanation available for this question

Six boxes are numbered 1,2,3,4,5 and 6. Each box must contain either a white ball or a black ball. At least one box must contain a black ball and boxes containing black balls must be consecutively numbered. find the total number of ways of placing the balls.

1. 15

2. 20

3. 21

4. 36

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Correct Answer :

Explanation :
No Explanation available for this question

In how many ways can 6 green toys and 6 red toys be arranged, such that 2 particular red toys are never together whereas 2 particular green toys are always together

1. 11! × 2!

2. 9! × 90

3. 4 × 10!

4. 18 × 10!

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Correct Answer :

18 × 10!

Explanation :
No Explanation available for this question

There are five comics numbered from 1 to 5. In how many ways can they be arranged, so that part-1 and part-3 are never together

1. 48

2. 72

3. 120

4. 210

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Explanation :
No Explanation available for this question

The number of ways which a mixed double tennis game can be arranged amongst 9 married couples if no husband and wife play in the same is:

1. 1514

2. 1512

3. 3024

4. 3028

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Correct Answer :

1512

Explanation :
No Explanation available for this question

Ten coins are tossed simultaneously. In how many of the outcomes will the third coin turn up a head

1. 210

2. 29

3. 3×28

4. None of these

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Correct Answer :

2⁹

Explanation :
No Explanation available for this question

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