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Question
A four digit number is to be formed using the digits 1 to 7
All digits of the number are different and repetition is not
allowed. 
1. How many such numbers can be formed ? 
2. How many such numbers are divisible by 4 ? 
 Question Submitted By :: Naravaashokkumar@gmail.co
I also faced this Question!!     Rank Answer Posted By  
 
  Re: A four digit number is to be formed using the digits 1 to 7 All digits of the number are different and repetition is not allowed. 1. How many such numbers can be formed ? 2. How many such numbers are divisible by 4 ?
Answer
# 1
the total numbers are formed are 7.6.5.4=840
the numbers that are divided by 4 are= 7.6.5.3=630
 
Is This Answer Correct ?    2 Yes 0 No
Satyam4friends
 
  Re: A four digit number is to be formed using the digits 1 to 7 All digits of the number are different and repetition is not allowed. 1. How many such numbers can be formed ? 2. How many such numbers are divisible by 4 ?
Answer
# 2
5040
1260
 
Is This Answer Correct ?    0 Yes 1 No
Guest
 
 
 
  Re: A four digit number is to be formed using the digits 1 to 7 All digits of the number are different and repetition is not allowed. 1. How many such numbers can be formed ? 2. How many such numbers are divisible by 4 ?
Answer
# 3
1)1 four digit number
2)1
 
Is This Answer Correct ?    0 Yes 1 No
R.ravi Kiran
 
  Re: A four digit number is to be formed using the digits 1 to 7 All digits of the number are different and repetition is not allowed. 1. How many such numbers can be formed ? 2. How many such numbers are divisible by 4 ?
Answer
# 4
Answer 1:
At unit's place 7 possibilities r dere.
At ten's place 6,
At hundred's place 5,
At thousand's place 4.

Therefore, 7*6*5*4=840

Answer 2:
for any number to b divisible by 4, the last two digit must
b divisible by 4. Such 2 digit combinations possible are.....
12,16,24,32,36,52,56,64,72,76. 
At last two places, any one combination out of these 10 is
possible. For first two digits in the 4 digit number, the
possible combinations are 5*4=20
So there r 20*10=200 numbers divisible by 4.
 
Is This Answer Correct ?    1 Yes 0 No
Sumati
 
  Re: A four digit number is to be formed using the digits 1 to 7 All digits of the number are different and repetition is not allowed. 1. How many such numbers can be formed ? 2. How many such numbers are divisible by 4 ?
Answer
# 5
Answer1 840;
Answer2 180;
 
Is This Answer Correct ?    1 Yes 0 No
Deepanjeyakumar
 
  Re: A four digit number is to be formed using the digits 1 to 7 All digits of the number are different and repetition is not allowed. 1. How many such numbers can be formed ? 2. How many such numbers are divisible by 4 ?
Answer
# 6
1.only one
2.none
 
Is This Answer Correct ?    1 Yes 0 No
Guest
 
  Re: A four digit number is to be formed using the digits 1 to 7 All digits of the number are different and repetition is not allowed. 1. How many such numbers can be formed ? 2. How many such numbers are divisible by 4 ?
Answer
# 7
There are total 7 nos
out of which a 4 digit no is to be formed.
7 nos can be arranged in 7! and 4 digit no. can be formed 
in 4*7! ways
 
Is This Answer Correct ?    0 Yes 0 No
Kaustubh
 

 
 
 
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