a+b=8,c-d=6,a+c=13,b+d=8` then `a,b,c,d`is - YouTube
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Observe the following pattern for obtaining the sums, then find the sum of numbers from 781 to 790? 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 = 55 11 + 12 + 13 + 14 + 15 + 16 + 17 + 18 + 19 + 20 = 155 21 + 22 + 23 + 24 + 25 + 26 + 27 + 28 + 29 + 30 = 255 ...
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