One day my son tore 15 sheets of a mathematics book. I was angry and asked him to add the page numbers of all the detached sheets and find the sum. After an hour he reported the sum to be 640. On hearing this my older daughter shouted saying , "That's wrong ". Who is right and why ?
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The older daughter is correct, because if you add 1+2+3+4+5+6+7+8+9+10+11+12+13+14+15 it doesnt come out to be 640.
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