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I en dansskola finns 5 0 0 elever. Dansskolan undervisar bl . a . i vals, rumba och tango , och 5 0 elever l

I en dansskola finns 500 elever. Dansskolan undervisar bl. a. i vals, rumba och tango, och 50 elever lr sig alla tre. 200 elever lr sig tango,130 lr sig rumba och 280 lr sig vals. 100 av tangoeleverna och 80 av rumbaeleverna dansar ocks vals. 80 rumbaelever dansar ocks tango.
a. Hur mnga elever dansar varken vals, rumba eller tango?
b. Hur mnga elever dansar tango men inte vals och rumba?
c. Hur mnga elever lr sig precis tv av de tre danserna?
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