miranda ties two ribbons in her hair each day before school.she can choose from her school's colours of red,blue and white.she has a bag of school ribbons with at least four of each colour in it.without looking , she pulls out some ribbons.how many must she pull out to be sure of a pair of the same colour?
dịch hộ luôn nhé,hứa tick,mik dang cần gấp
