CBSE 11th Standard Maths Subject Probability Ncert Exemplar 4 Marks Questions With Solution 2021
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CBSE 11th Standard Maths Subject Probability Ncert Exemplar 4 Marks Questions With Solution 2021
11th Standard CBSE
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Reg.No. :
Mathematics
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One card is drawn from a well-shuffled deck of 52 cards.Calculate the probability that the card will be
an ace(a) -
One card is drawn from a well-shuffled deck of 52 cards.Calculate the probability that the card will be
a black card(a) -
One card is drawn from a well-shuffled deck of 52 cards.Calculate the probability that the card will be
not a black card(a) -
Suppose an integer from 1 through 1000 is chosen at random.Find the probability that the integer is a multiple of 2 or a multiple of 9.
(a) -
Three squaresof chess board are selected 2 squares of ane colour and other of a different colour.
(a)
4 Marks
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CBSE 11th Standard Maths Subject Probability Ncert Exemplar 4 Marks Questions With Solution 2021 Answer Keys
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\(\frac { 1 }{ 13 } \)
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\(\frac { 1 }{ 2 } \)
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\(\frac { 1 }{ 2 } \)
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0.556
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We know that, in a chess board, there are 64 squares of which 32 are white and 32 are black.
Clearly, 3 squares can be selected in \(^{ 64 }{ C }_{ 3 }\) ways.
Let E be the event of getting 2 squares of one colour and other of a different colour.
Then, n(E) = \(^{ 32 }{ C }_{ 2 }\times ^{ 32 }{ C }_{ 2 }+^{ 32 }{ C }_{ 1 }\times ^{ 32 }{ C }_{ 2 }\)
[ 2 squares of one colour and 1 of other can be 2w, 1B or 1w , 2B]
\(2\times ^{ 32 }{ C }_{ 2 }\times ^{ 32 }{ C }_{ 1 }\)
\(\frac { 16 }{ 21 } \)
4 Marks
