Latest TCS Aptitude Question SOLUTION: You have to form a 6 digit even number with numbers from 1 to 7, the digit second to last should be even.

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(#M40038958) TCS Numerical Ability question Permutation and Combination Keep an EYE

You have to form a 6 digit even number with numbers from 1 to 7, the digit second to last should be even.

Asked In TCS bans (9 years ago)

Unsolved Read Solution (12)

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Read Solution (12) :

karthikeyank  (9 years ago)

ANS IS:720
1 2 3 4 5 6 7
- - - - - - -
3C2*2! WILL FILL THE LAST 2 DIGITS
REMAINING PLACES: 5C4*4!
WE HAVE (5C4*4!)*(3C2*2!) =720

Is this solution Helpfull? Yes (16) | No   

bhuvana  (9 years ago)

digit to be even last digit has 3 chances ie:2 or 4 or 6
digit 2nd to last should be also even so after filling last digit , this must have 2 chances.
then first place will posses: 5 chances
then second place will posses: 4 chances
then third place will posses: 3 chances
then next place will posses:2 chances
finally product of chances are 5*4*3*2*2*3=720

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Swayanti Bhaumik  (9 years ago)

If repetition is allowed then 7*7*7*7*3*3 @ santosh

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abhyuday pal  (9 years ago)

nowhere its mentioned that repetition is not allowed.
so the answer should be 7*7*7*7*3*7

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

sindhu  (9 years ago)

ans: 420
bcz it is 6 digit num ------
1st digit : we can take any number frm 1 to 7
and second to last should be even 2,4 or 6
so ans is 7*5p3 = 420

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santhosh mohan  (9 years ago)

What if repetition is allowed???

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vishnupriya  (9 years ago)

ans is 720

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payal sharma  (9 years ago)

if the second last is even then a total of 3 digits can be filled.
if the number to be formed is odd then the 6th place has 4 digits that can be filled.
hence, 2*3*4*5*3*4=720

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sravya  (9 years ago)

135462
second to last is even and the 6 digit is an even number

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shyam  (9 years ago)

2*3*4*5*3*2=720

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PRADEEPA  (9 years ago)

ans:720
explanation:2*3*4*5*2*3=720

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kamlesh mishra  (9 years ago)

ans 720

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