Latest NDA Aptitude Question SOLUTION: Which one among the following is the chemical formula of gypsum which is an ingredient of cement ?
(a) Ca2SiO4 (b) CaSO4.2H2O (c) CaO (d) CaSO4.3H2O
Pure mathematics is the world's best game. It is more absorbing than chess, more of a gamble than poker, and lasts longer than Monopoly. It's free. It can be played anywhere - Archimedes did it in a bathtub.