How many three digit numbers are there in which all digits are odd?
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60.............! Hope it helps........!
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Answer:
Hey Mate,
Odd Numbers : A numbers which Cannot be perfectly divided by 2. For Example : 1, 3, 5, 7, 9, 11, 13, 15, 16, 19 ......
Even Numbers : A number which can perfectly divide by 2. For Example : 2 , 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, .......
Three Digit numbers in which all numbers are Odd.
Example.
( 1, 3, 5 ) , ( 5, 7, 9 ) , ( 1, 3, 7 ) , ( 5, 7, 3 ) , ( 1, 3, 9 ) , ( 5, 7, 1 )
So,
Total Available Pair in which all digits are odd :
=> 6 × 3!
=> 6 × 6
=> 36.
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