class ten probability lesson
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(i) 1,4,9,16,25,36,49,64,82,100 are the perfect squares.
Hence P = 10/100 = 1/10 = 0.1%
(ii) Divisible by 7: from 7 till... 98 (7 x14)
Hence P = 14/100 = 7/50
(iii) Prime numbers < 10 are 2,3,5,7
P = 4/100 = 2/50 = 1/25
(iv) total divisible by 5 are 20 numbers from 5 to 100.
Hence 100 - 20 = 80 are not divisible.
So, P (not divisible by 5) = 80/100 = 40/50 = 4/5 Ans
Hence P = 10/100 = 1/10 = 0.1%
(ii) Divisible by 7: from 7 till... 98 (7 x14)
Hence P = 14/100 = 7/50
(iii) Prime numbers < 10 are 2,3,5,7
P = 4/100 = 2/50 = 1/25
(iv) total divisible by 5 are 20 numbers from 5 to 100.
Hence 100 - 20 = 80 are not divisible.
So, P (not divisible by 5) = 80/100 = 40/50 = 4/5 Ans
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