It A={x:x is a non negative integer and x² = x}, then how
many proper subset does A have?​

hello which   of the following there is nothing!

phaneritic textures in which phaner means visible so phaneritic textures are standard of impertinent volcanic rocks. these rocks crystallized gradually under the surface of earth. when the magma cools deliberately then the ores have chance to develop and produce long crystals.

condenser is used to focus in the light microscope.