RE: Maths Brain Teasers 49:: Complete the Number Series???
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sum of first 2 numbers (rows) in a column + 1 is number in 3rd row
If sum is a double digit number just use the 2nd digit
5 + 3 + 1 = 9
7 + 8 + 1 = 16 so answer is 6
Last column
7 + 9 + 1 = 17 so answer is 7
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