मै I.A.S बनूँगा ||

Fill in the blank with suitable article given in bracket. _______ I.A.S (a/an/the)

Number of attempts required by a candidate to clear I.A.S. examination. Then the random variable is

Express 1 g cm^(-3) in S.I., is bigger unit? Which of these two units C.G.S or S.I., is a bigger unit?