Latest TCS Aptitude Question SOLUTION: How many 4 digit number contain number 2 ?

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How many 4 digit number contain number 2 ?

Asked In TCS purva (9 years ago)

Solved RAKESH Read Solution (9)

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Read Solution (9) :

RAKESH  (9 years ago) Best Solution

total 4 digit no. = 9*10*10*10 = 9000

not containing 2 = 8*9*9*9 = 5832

total 4 digit number contain 2 = 9000 - 5832 = 3168

Is this solution Helpfull? Yes (79) | No (2)  

Ayush Upadhyaya  (9 years ago)

Correct ans is 3168
Total number of 4 digit numbers from 1000-9999=(9999-1000)+1=9000
Now consider those 4 digit numbers which are not having 2 and repetition of digits is allowed
so these 4 digit numbers can be constructed from digits 0,1,3,4,5,6,7,8,9=total 9 digits
now number of 4 digit numbers possible from above set of digits=8*9*9*9=5832
8(for thousand place as 0 is not allowed here)
9(for each hundred,tens and ones place as repetition of digits is allowed)
now all 4 digit numbers containing 2 will be
all 4 digit numbers - all 4 digit numbers not containing 2
9000-5832=3168 is the correct answer!!

Is this solution Helpfull? Yes (16) | No (2)  

parash  (9 years ago)

900+900+900+1000=3700

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Puja   (9 years ago)

total no =3168 contains number 2
but 3700 ways to containing no 2

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Narasapu Hari prasad  (9 years ago)

1000+8*10*10+8*9*10+8*9*9

Is this solution Helpfull? Yes (1) | No (3)  

tirupathi reddy  (9 years ago)

Total 1800=432+432+432+504

1. Let the once place have 2
__ __ __ 2.

The possibility is 6*8*9=432

2. Let the tens place have 2
__ __ 2__.

The possibility is 6*8*9=432

3. Hundreds place.
__2__ __.

The possibilities are 6*8*9=432

4. 2 __ __ __

The possibilities are 7*8*9=504.

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

KUMAR SAJJAN  (9 years ago)

qstn is ((x^2)-x-1))^x+2 and soln will be 0,-1,2,-2......... so plz 1st understnd it then give the soln..... kaha kaha se soln late ho sb yar dimag kharab ho jata hai padh kar

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prasanna  (9 years ago)

1000+90+90+100=1280

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mallikarjuna naik  (9 years ago)

ans 3
by putting values of x=0,-1,2 then only satisfies the eq.

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