SOLUTION: work out the value of the series
1+2+4+5+7+8+10+11+......+50
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Question 836815: work out the value of the series
1+2+4+5+7+8+10+11+......+50
Answer by richard1234(7193) (Show Source): You can put this solution on YOUR website!
1+2+3+...+50 = 50*51/2 = 1275
We are subtracting off the multiples of 3 from 3 to 48, inclusive, in which 3+6+9+...+48 = 3(1+2+...+16) = 3(16*17/2) = 408. The sum is equal to 1275 - 408 = 867.
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