Ma nei sum aduna, "sum = n/2 * (a + l)" formula amadi ahanba thokchaba formula kana haraoba oina khangdana? Eina hotna touraga mangda, tablet ta calculator awangba pumshap tannaba swarga chaokhatpa! Calculator-ta number teina yengdriba oirammi, "n/2*(a+l)"-gi makhada digit leiba yai. Adu ahi — formula asina digit leire, aduga computer-o calculator-o aduga eina *eina* yengdriba numit amukka, a-sa-sa thajana.
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