Jak to policzyć?
1/4 * 7/10 + 1/4 * 7/10 + 1/6 * 3/10 + 1/6 * 3/10 + 1/6 * 3/10 = ?
1/4 * 7/10 + 1/4 * 7/10 + 1/6 * 3/10 + 1/6 * 3/10 + 1/6 * 3/10 = 7/40+7/40+3/60+3/60=14/70+6/60=14/70+1/10=21/70
1/4 * 7/10 + 1/4 * 7/10 + 1/6 * 3/10 + 1/6 * 3/10 + 1/6 * 3/10=7/40+7/40+3/60+3/60+3/60=14/40+6/60+3/60=14/40+9/60=84/240+36/240=120/240=1/2
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1/4 * 7/10 + 1/4 * 7/10 + 1/6 * 3/10 + 1/6 * 3/10 + 1/6 * 3/10 = 7/40+7/40+3/60+3/60=14/70+6/60=14/70+1/10=21/70
1/4 * 7/10 + 1/4 * 7/10 + 1/6 * 3/10 + 1/6 * 3/10 + 1/6 * 3/10=7/40+7/40+3/60+3/60+3/60=14/40+6/60+3/60=14/40+9/60=84/240+36/240=120/240=1/2