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Permutation Combination for eLitmus | eLitmus Aptitude Questions

1

How many 4 digit can be formed by using 2,3,4,5,6,7 only once divisible by 25
remember only once* divisible by

A.

40

B.

12

C.

20

D.

24

See Answer & Explanation Lets Discuss
Correct answer is : D
Explanation

If number is to be divisible by 25, it should be ended with {25,50,75,100)...
So here, the numbers should end with (25 nd 75) 

if we take the no. to be ended with 25, the possibities are 4!/2= 24/2= 12

if we take the no. to be ended with 75, the possibities are 4!/2= 24/2= 12

so 12+12=24

 
2

There are 10 Letter and correspondingly 10 different Address if the letter are put into envelope randomly then find the Probability that Exactly 9 letter will at the Correct Address??

A.

0

B.

1/10

C.

2/10

D.

3/10

See Answer & Explanation Lets Discuss
Correct answer is : A
Explanation

zero because if 9 letters are in correct address then the 10th letter will be automatically in correct address

 
 

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Permutation Combination for eLitmus | eLitmus Questions

Permutation and Combination Questions for eLitmus, eLitmus Permutation Combination Questions for pH Test elitmus Aptitude Questions, pH Test Aptitude Questions

eLitmus Permutation Combination Questions

eLitmus Permutation Combination Questions, Every pH Test paper has atleast 1 question from Permutation and Combination which can be really easy to solve if you have practised these Permutation Combination Questions for eLitmus well.