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What is the number of ways of forming 6 digit number whose sum of digits is even?
I look at it this way:
-- There are 90,000 numbers with five digits. (100,000 minus 10,000 with less than 5 digits)
-- If the sum of the first 5 digits is odd, it can be made even by using 1, 3, 5, 7, or 9
for the 6th digit ... 5 choices.
-- If the sum of the first 5 digits is even, it remains even by using 2, 4, 6, 8, or 0
for the 6th digit ... 5 choices.
-- So, for any one of the 90,000 five-digit numbers, there are 5 choices for the 6th digit
that result in an even sum of all six.
-- So, there must be 450,000 suitable 6-digit numbers.
What else can I help you with?
Which the largest 3 digit prime number whose digits all primes?
The largest 3 digit number whose digits are all primes is 777. The largest 3 digit number with different prime digits is 753.
What are the largest three digit prime number whose digits are all primes?
The largest three digit prime number whose digits are all primes is 773.
What is a 2-digit number the sum of whose digits is 1?
1
What is the sum of positive six digit integers whose digits are a permutation of the digits in the number 123456?
279,999,720
What is the largest three digit number whose digits add to 20?
992
Which the largest 3 digit prime number whose digits all primes?
The largest 3 digit number whose digits are all primes is 777. The largest 3 digit number with different prime digits is 753.
What is the four digit number whose digits are reversed when multiplied by nine?
Find a four digit number whose digits will be reversed when multiplied by nine?
What are the largest three digit prime number whose digits are all primes?
The largest three digit prime number whose digits are all primes is 773.
What is a 2-digit number the sum of whose digits is 1?
1
What is the sum of positive six digit integers whose digits are a permutation of the digits in the number 123456?
279,999,720
What is the largest three digit number whose digits add to 20?
992
What is the largest four-digit number whose digits are all prime?
7777
What is the gratest three digit number whose digits have a sum of 13?
940
What is the smallest six - digit number whose digits are all odd?
111111
What is the units digit of the least whole number greater than 1000 whose digits are all different?
What is the units digit of the least whole number greater than 1000 whose digits are all different?
What three digit number whose digits are all odd and different has a sum of the three digits that is palindromic?
137?
The number whose ones digit is 8 less than its tens digit . The sum of the digits is a 2 digit number?
91 since the ones digit is 8 less than 9 and the two digits, 9+1 = 10, a two-digit number.
