Question

A box contains 2 white balls 3 black balls and 4 red balls. In how many ways can 3
balls be drawn from the box, if at least. one black ball is to be included in the draw?
(a) 32
(b) 43
(C) 64
(d) 96​

Answer 1

Answer:

C.64 ways

Step-by-step explanation:

take the balls as 1,2,3,4,5,6,7,8,9

where1,2,3 are blacI balls

So the patterns are

123

124 234 134

125 235 135

126 236 136

127 237 137

128 238 138

129 239 139

145

146 156

147 157 167

148 158 168 178

149 159 168 179 189

and the last triangular order repeated twice with 2 & 3 in place of 1

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