[" - single correct "],[" From "6" different novels and "3" different dictionaries,"4" novels and "1" dictionary are to be selected "],[" and arranged in a row on a shelf so that the dictionary is always in the middle.The number of "],[" such arrangement is "],[[" (1) at least "750" but less than "1000," (2) at least "1000],[" (3) less than "500," (4) at least "500" but less than "750]]