Total no. of possible outcomes = 15

{5 black, 7 red & 3 white balls}

**(i) E ⟶ event of drawing red ball**

No. of favorable outcomes = 7 {7 red balls}

Probability, P(E) = (No.of favorable outcomes)/(Total no.of possible outcomes)

P(E) = 7/15

**(ii) E ⟶ event of drawing black or white**

No. of favourable outcomes = 8 {5 black & 3 white}

P(E) = 8/15

**(iii) E ⟶ event of drawing black ball**

No. of favourable outcomes = 5 {5 black balls}

P (E) = 5/15 = 1/3

Bar E⟶event of not drawing black ball

P (Bar E)=1−P(E)

= 1 − 1/3 = 2/3