Latest TCS Aptitude Question SOLUTION: how many 3-digit numbers can be formed from the digits 2,3,5,6,7 and 9 which are divisible by 5 and none of the digit is repeated. 5 10 15 20

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how many 3-digit numbers can be formed from the digits 2,3,5,6,7 and 9 which are divisible by 5 and none of the digit is repeated.

5
10
15
20

Asked In TCS juhe rawat (10 years ago)

Unsolved Read Solution (11)

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karthigabalamurugan  (10 years ago)

Ans:20 the key word here is divisible by 5 hence in units place we have to fill 5
oly which is divisible by 5.(1 way)..tens place we have a choice to fill among 5 numbers(5 ways)..and last in hundredth place we have to choose among any four number (4 ways) hence..(5*4*1)=20

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Shoaib  (10 years ago)

5*4*1=20

Is this solution Helpfull? Yes (5) | No   

kapil dev kumar  (10 years ago)

any 3 digit number formed from given digits to be divisible by 5 the unit digit must be 5.so unit digit can take only one number and digit at ten's place can be filled by 5ways nd similarly..digit at hundred's position can be filled by (5-1=4)numbers..
total 3 digit number divisible by 5 frome given digits =5*4*1=20

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piyush  (10 years ago)

ans -20
as unit place is occupied by 5 only and tens and hundred place are occupied as 4*5

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juhe rawat  (10 years ago)

@shoaib pls expln the ans

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asif  (10 years ago)

last dgt is fixed..so 5*4=20

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jit dhar  (10 years ago)

ans will be 5p2=20.

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akshay lahoty  (10 years ago)

20 since 5 is fixed reamining is 5*4

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Mallik konambhotla  (10 years ago)

the last digit should be multiple of 5
so we can arrange in 1 way
the 2nd digit can be arranged in remaining 5ways
and 1st digit in 4 ways
so 5*4*1=20ways

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Supraja  (8 years ago)

20
as the number should be divisible by 5,so the unit digit must be 5.After that for ten's place we have 5 ways and for hundred's place we have 4 ways.so the total no.of ways=5*4=20 (if the digits is not repeated)

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Sudhir Kumar Gupta  (8 years ago)

Since it is 3 digit divisible by 5

so unit digit we can fill by one way
tens place we can fill by 4 ways.
hundreds place we can fill by 5 ways.

total no of ways is (5*4*1)=20

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