A basket contains 3 yellow, 5 purple and 3 red flowers. If 3 flowers are drawn at random, what is the probability that all are purple?
Total number of flowers = 3 + 5 + 8 = 11 Let S be the sample space. Then, n(S) = number of ways of drawing 3 flowers out of 11 = ¹¹C₃ = (11 × 10 × 9)/(3 × 2 × 1) = 165 Let E= event of drawing all the flowers are of purple colour n(E) = ⁵C_3 = (5 × 4)/2 = 10 ∴ P (E) = (n(E))/(n(S)) = 10/165 = 2/33
Insects, which feed on one type of food, are called _______.
Which of the following is correctly matched ?
The silkworm larva ceases to eat and begins spinning silk all over its body from ____
Which one of the following hormones sclerotizes the newly formed cuticle?
Shellac is secreted by
Apis mellifera is also known as
Order in which mosquito are present is
………………….. is associated to achieve the goal of Sweet Revolution in country
Tassar silk is also known as
Which of the following pair is not correct?