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Question

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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101+102+103+104+105+106+107+108+109+110=1055
251+252+253+254+255+256+257+258+259+260=2555

A
7055
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B
7855
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C
7955
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D
8155
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Solution

The correct option is B 7855
781+782+783+784+785+786+787+788+789+790=7855

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