"אנחנו חייבים ללמוד הרבה נוסחאות."
Translation:We must learn lots of formulae.
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<3 DuoLingo for using formulae. Complaining about this would be like complaining if Duo's answers were phrased like "the bank in which i keep my money" and not "the bank i keep my money in". Nothing wrong with teaching people a slightly more formal and technically correct form