【答案】學(xué)校樂(lè)器隊(duì)按計(jì)劃招收了42名新學(xué)員,兩項(xiàng)都不會(huì)的有1人,那么有41名同學(xué)會(huì)一項(xiàng)或者兩項(xiàng)都會(huì).會(huì)拉小提琴的有27人,這27人里面包含了會(huì)彈電子琴又會(huì)拉小提琴的16人,所以只會(huì)拉小提琴的有27-16=11(人).那么會(huì)拉電子琴的有41-11=30(人),這其中包括只會(huì)拉電子琴的和兩項(xiàng)都會(huì)的.



