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Earn +20 ptsQ: What will be the sum of first 25 even numbers?
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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.
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