CAT
Exam
Numerical Ability
Permutation and Combination
find da maximum value of n such that 570*60*30*90*100*500*700*343*720*81 is perfectly divisible by 30^n answer
Read Solution (Total 4)
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- n=4
since after multipliying we get 8 zeroes - 9 years agoHelpfull: Yes(0) No(1)
- 8
no of zeroes in this is 11 and no of multiple of 3 is 8 so 8 is the correct - 9 years agoHelpfull: Yes(0) No(2)
- factors of 30=2,3,5....in this 2 is more frequently occuring so .. we will only calculate no of 3 and 5 present in the sequence...
no 5 3
------------------
570 1 1
60 1 1
30 1 1
90 1 2
100 2 0
500 3 0
700 2 0
343 0 0
720 1 2
81 0 4
------------------------
total 12 11
so n=11 - 9 years agoHelpfull: Yes(0) No(0)
- 11 no. of zeros and 11 no. of 3 is here.
so n=11 - 9 years agoHelpfull: Yes(0) No(0)
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