Latest TCS Aptitude Question SOLUTION: What is the number of zeros at end of number 28! + 29!? ans-7

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(#M40154023) TCS Numerical Ability question NUMBER SYSTEM Keep an EYE

What is the number of zeros at end of number 28! + 29!?


ans-7

Asked In TCS TAUSEEF AMEEN (8 years ago)

Unsolved Read Solution (5)

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RAKESH  (8 years ago)

28! + 29!
= 28!*(1+29)
= 28! * 30

now 28! has [28/5] + [28/5^2] = 6 zeroes
so 28! * 30 will have 7 zeroes at end.

Is this solution Helpfull? Yes (34) | No (1)  

abhishek sharma  (8 years ago)

28!+29*28!
28!(1+29)
28!*30
28!/5+28!/25*30
5+1+1
7

Is this solution Helpfull? Yes (3) | No   

Narendra Dhaker  (8 years ago)

At the end zero is only possible if there is any combination of 5 &2 so
28! + 29!
=> 28! + 29 * 28!
=> 30* 28!
=> 30* [ 28* 27 *26 *25...24..*20*.....15 *.12 ..10* ....5*....2 ]
=> by these cobination we will get zero at the end [24*25] + 20+ 15*12 +10+ 5*2
Total no of zero is 7

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

Karthick S  (8 years ago)

28!+29!=9146650338351415815045120000000. at the end there are only 7 zeros

Is this solution Helpfull? Yes (3) | No (7)  

NARENDRA KUMAR  (8 years ago)

answer may b 6
28!/5+5/5+1=6
else correct me

Is this solution Helpfull? Yes | No (8)  

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