Qid : 102 - a boy added all natural numbers from 1 to 20. however he added one number twice, due to which the sum becomes 215. what is the number which he added twice?
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1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20+X=215
210+X=215
X=5
the no. he added twice is 5
210+X=215
X=5
the no. he added twice is 5
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