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What is the sum of the digits of the first 25 even counting numbers?
155
How do you figure out the sum of the first 25 odd numbers without doing 1 3 5 and so on?
The sum of the first n odd numbers is n squared. 25 x 25 = 625
What is the difference between the sum of all even numbers and odd numbers from 25 to 100?
The sum of the even numbers is (26 + 28 + ... + 100); The sum of the odd numbers is (25 + 27 + ... + 99) Their difference is: (26 + 28 + ... + 100) - (25 + 27 + ... + 99) = (26 - 25) + (28 - 27) + ... + (100 - 99) = 1 + 1 + ... + 1 There are (100 - 26) ÷ 2 + 1 = 38 terms above which are all 1; their sum is 38 x 1 = 38. So the difference of the sum of all even numbers and all odd numbers 25-100 is 38.
How many 2-digit even numbers have an odd number as the sum of their digits?
25 of them
The sum of two consecutive positive even numbers is 52 What is the smaller number?
There is no solution. You could do it if the numbers were odd: 25 and 27 are consecutive odd numbers that equal 52.
What will be the sum of the first 25 prime numbers?
The sum of the first 25 prime numbers is 1,060.
What is the sum of the digits of the first 25 even counting numbers?
155
There are 25 prime numbers less than 100 is their sum even or odd?
Oh, what a happy little question! Let's take a look at those prime numbers. When we add them up, we find that their sum is actually even. Isn't that just a delightful surprise? Remember, in the world of numbers, there's always a little bit of magic waiting to be discovered.
What is the sum of the first 25 even numbers?
The sum of the first n positive integers (i.e. 1+2+3+...+n) is given by n(n+1)/2 so the sum of the first 25 positive integers is 1+2+3+...+25 = 25x26/2 = 325. The sum of the first 25 EVEN numbers will be double this i.e. 2+4+6+...+50 = 650.
Sum of 1st 25 prime no?
The sum of the first 25 prime numbers is 1,060.
What is the sum of the first 25 multiples of 12?
The sum of the first 25 numbers is 25*26/2 = 325 So the sum of the first 25 multiples of 12 is 325*12 = 3900
What is the sum of the first 25 odd numbers?
625
How do you figure out the sum of the first 25 odd numbers without doing 1 3 5 and so on?
The sum of the first n odd numbers is n squared. 25 x 25 = 625
What is the difference between the sum of all even numbers and odd numbers from 25 to 100?
The sum of the even numbers is (26 + 28 + ... + 100); The sum of the odd numbers is (25 + 27 + ... + 99) Their difference is: (26 + 28 + ... + 100) - (25 + 27 + ... + 99) = (26 - 25) + (28 - 27) + ... + (100 - 99) = 1 + 1 + ... + 1 There are (100 - 26) ÷ 2 + 1 = 38 terms above which are all 1; their sum is 38 x 1 = 38. So the difference of the sum of all even numbers and all odd numbers 25-100 is 38.
How do you get the sum of the first 25 numbers by a means other than adding?
By using the formula for an arithmetic series. This is basically obtained by reasoning: The sum of the first 25 numbers is the same as 25 multiplied by the average of those numbers; the average in this case is simply (1 + 25) / 2.
How many 2-digit even numbers have an odd number as the sum of their digits?
25 of them
The sum of 2 numbers is 25 and their product is 156 What are the numbers?
If the sum of 2 numbers is 25 and their product is 156, the numbers are 12 and 13.
