Question
A letter is taken out at random from ‘ROORKEE’ and
another is taken out from ‘BOOKKEEPER’. The probability that they are the same letter isSolution
Hence, B and P are not common and same letters can be R, O, K, E Probability of choosing R = (²C₁)/(⁷C₁) × (¹C₁)/(¹⁰C₁) = 1/35 Probability of choosing O = (²C₁)/(⁷C₁) × (²C₁)/(¹⁰C₁) = 2/35 Probability of choosing K = 1/(⁷C₁) × (²C₁)/(¹⁰C₁) = 1/35 Probability of choosing E = (²C₁)/(⁷C₁) × (³C₁)/(¹⁰C₁) = 3/35 Hence, Required Probability = 1/35+ 2/35+ 1/35+ 3/35 = 7/35 = 1/5
The internal, or geothermal, (1)/heat from within the Earth are (2)/ responsible for the fact that (3)/temperature increases with depth (4).
The consecration of (1)/the Eucharist, as well as (2)/the administration, (3)/were performed in English (4).
Most risk factors for (1)/pre-school overweight are modifiable (2)/and allows at-risk groups to (3)/be identified, say researchers (4).
An eye examination is called for (1)/once a year to ensure that (2)/diabetes have not resulted in retinopathy, (3)/which could lead to blindness (4).
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