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(60+2)*30/2=930

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1+2+3+…+30 = 31*15 = 465

2+4+6+…+60 = 465+465 = 930

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First 30 even numbers
2, 4, 6…………56, 58, 60

2+60=62
4+58=62
There will be 15 sets of 62,
Sum = 15×62=930

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30 x 2 = 60 (30th)
(2 + 60) x (30/2) = 930

Ans : 930.

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