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What is the sum of all number in the yellow square in the above multiplication table?

 

 Dec 28, 2019
 #1
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The table forms an AP
55, 110, 165, 220..........etc.
Sum = 10/2 * [2*55 + 55(10 -1)]
Sum =   5 *    [110 + (55*9) ]
Sum =   5 *    [ 605 ]
Sum = 3,025

 Dec 28, 2019

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