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CBSE Class 9 Answered

a box contains 40 balls of same size and weight.Among the balls 10 balls are white, 16 are red and rest are black.What is the probability that the ball drawn from the box is not black ?
Asked by Vikas | 25 Jan, 2016, 12:55: PM
answered-by-expert Expert Answer

begin mathsize 14px style T o t a l space b a l l s equals 40 N u m b e r space o f space w h i t e space b a l l s equals 10 N u m b e r space o f space r e d space b a l l s equals 16 rightwards double arrow N u m b e r space o f space b l a c k space b a l l s equals 40 minus left parenthesis 10 plus 16 right parenthesis equals 40 minus 26 equals 14 N o w comma P left parenthesis g e t t i n g space b l a c k space b a l l right parenthesis equals 14 over 40 rightwards double arrow P left parenthesis n o t space g e t t i n g space a space b l a c k space b a l l right parenthesis equals 1 minus 14 over 40 equals 1 minus 7 over 20 equals fraction numerator 20 minus 7 over denominator 20 end fraction equals 13 over 20 end style

Answered by | 25 Jan, 2016, 06:02: PM

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