Q: What is the sum of the first 40 odd numbers?

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1 ,3, 5, 7 ,9......, 77, 79. Sum of first 40 odd numbers is 1600. This is the answer

The sum of the first 40 whole numbers is 780.

The sum of the first 40 even numbers is 1,640.

40 * * * * * The correct answer is 6400.

The answer is 1600. All you have to do is times the number given into itself. Example first 50 odd numbers would be 50x 50= 2500.

There are 20 odd numbers in 40.

There can be no number with an odd sum of 8 because 8 is not odd!

Three prime numbers whose sum is 42 are 23, 17 and 2

The odd numbers between 40 and 53 are 41,43,45,47,49,51.

There are 40 odd numbers between 20 and 100. Remember that an odd number is every second number. There are 80 numbers between 20 and 100, so there are 40 odd numbers and 40 even numbers.

19,20,21

45

420 (2 to 40)

They are: 7+9+11+13 = 40

The sum is 68.

These numbers between 1 and 40 have an odd number of factors: 4, 9, 16, 25, 36.

There is a 40% chance that it will be an odd number. Explanation: The first five prime numbers are 2, 3, 5, 7, and 11. If one of the two numbers chosen is 2, the sum of the two numbers will be odd. 2 + 3 = 5 2 + 5 = 7 2 + 7 = 9 2 + 11= 13 But, if both numbers chosen are odd, the sum will be an even number. 3 + 5 = 8 3 + 7 = 10 3 + 11 = 14 5 + 7 = 12 5 + 11 = 16 7 + 11 = 18 So, there are four possible combinations out of 10 that result in a sum that is odd. Another way to do this, without listing the possible combinations, is to determine the chance of randomly selecting the 2. Two numbers are being chosen from five, so there is a 2/5 = 40% chance of selecting a 2, which means the sum will be odd.

The sum of the numbers 1 to 39 = 39 x 40 ÷ 2 = 780 The sum of the numbers 1 to 60 = 60 x 61 ÷ 2 = 1830 Therefore the sum of the numbers 40 to 60 = 1830 - 780 = 1050

2+4+6+8+10........+40=420

The probabiliy of selecting odd or prime numbers from 1 to 50. First find out the probability of selecting odd numbers : 25/50 is 1/2. Lets find out the probability of selecting prime numbers: 15 / 50 . so, total is 40/ 50 is 0.82.

The numbers are 40, 41 and 42.

None that are all odd numbers. But, there are two sets of three consecutive numbers containing a mix of even/odd that add up to 120. They are 39, 40 and 41 and also 38, 40 and 42.

The sum of two numbers between 20-40 is 58. The difference is 12

11

30

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