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On the 1st day, he walks 11 km, on 2nd day, 22 km, and so on... rnSo, the sum= 11+22+33+44+.....+14*11 rn =11(1+2+3+4+......+14) rn =11{14*15}/2=1155 km
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On the 1st day, he walks 11 km, on 2nd day, 22 km, and so on...
rnSo, the sum= 11+22+33+44+.....+14*11
rn =11(1+2+3+4+......+14)
rn =11{14*15}/2=1155 km