Q: Find out the ones in the sum of 31 plus 32 plus 33 plus 34 plus 35 plus 36 plus 37 plus 38?

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31 Because, twice 31 is 62. And, 62 plus 13 is 75.

The sum of the numbers given is 31. 1 + 2 + 4 + 8 + ... + 2n = 2n+1 - 1

500 + 680 + 031 ------- 1,211

31+32+33 = 96

30*31/2 = 465

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31

15.25 plus 15.75 is 31

That would be 34.

31 Because, twice 31 is 62. And, 62 plus 13 is 75.

The sum of the numbers given is 31. 1 + 2 + 4 + 8 + ... + 2n = 2n+1 - 1

Expressed in octal, the decimal sum 27 + 31 = 58 would be expressed: 33 + 37 = 72

16 + 31 = 31 + 16This shows COMMUTATIVE PROPERTY OF ADDITION. It means that changing the order of the addends does not affect the sum.

Is the sum 31

500 + 680 + 031 ------- 1,211

31 and 32

31+32+33 = 96

31