Latest TCS Aptitude Question SOLUTION: How many positive integers less than 450 can be formed using 1,2,5 and 6 for it's digits, with each digit being used only once?

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How many positive integers less than 450 can be formed using 1,2,5 and 6 for it's digits, with each digit being used only once?

Asked In TCS Karthika (10 years ago)

Solved SAGAR DAS Read Solution (12)

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Read Solution (12) :

SAGAR DAS  (10 years ago)

Ans: 28
Num of possible 1 digit numbers = 4
Num of possible 2 digit numbers = 4*3 = 12
For 3 digit numbers, to meet the condition
the number should be less than 450, 5 and 6 cannot be in the hundredth
position.
Num of possible 3 digit numbers = 2*3*2 = 12
Total +ve integers meeting the condition = 4+12+12 = 28

Is this solution Helpfull? Yes (62) | No (6)  

Prakash Singh  (10 years ago)

yes it will be 28 numbers.... i made a mistake...

Is this solution Helpfull? Yes (8) | No (3)  

Amisha Agarwal  (10 years ago)

three digit no=2*3*2=12
two digit no=4*3=12
one digit no=4
so, total nos= 12+12+4=28 ANS

Is this solution Helpfull? Yes (4) | No   

Prakash Singh  (10 years ago)

12 such integers are possible

Is this solution Helpfull? Yes (2) | No (7)  

vaishnavi  (9 years ago)

guys will u plz xplain me why is it 2*3*2 for 3digit no.?

Is this solution Helpfull? Yes (2) | No (1)  

Karthika  (10 years ago)

@ Prakash: Yes,Many made the same mistake in a test,including me!

Is this solution Helpfull? Yes (1) | No (1)  

Prakash Singh  (10 years ago)

@karthika- yup!! we get the perception that a 3 digit no less than 450 is required..

Is this solution Helpfull? Yes (1) | No (1)  

muttareddy veera mani devi  (10 years ago)

no of integers should be 28.
1 digit no's=4
2 digit no's be=4*3=12
3 digit no's be=2*3*2=12

Is this solution Helpfull? Yes (1) | No   

Karthika  (10 years ago)

Yeah! yu r ryt :D

Is this solution Helpfull? Yes | No (1)  

saurabh   (10 years ago)

16+4+12=32

Is this solution Helpfull? Yes | No (9)  

Amit Ganguly  (10 years ago)

1 digit number = 4
2 digit number = 4*3 =12
3 digit number< 450 =2*3*2=12
adding three =28

Is this solution Helpfull? Yes | No   

agnel  (9 years ago)

can anyone explain . Num of possible 2 digit numbers = 4*3 = 12

where does the 3 come from ? and what is it?

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