A boy stands 12 metres from the foot of the building and observes the angle of elevation of the top of the building.
Permutations and Combinations
If there are 5 dishes, they can be relished in any order at a time. In permutation, it should be in a particular order. In combination, the order does not matter. Take 3 letters a, b, and c. The possible ways of pairing any two letters are ab, bc, ac, ba, cb and ca. It is in a particular order. So, this can be called the permutation of a, b, and c. But if the order does not matter then ab is the same as ba. Similarly, bc is the same as cb and ac is the same as ca. Here the list has ab, bc, and ac alone. This can be called the combination of a, b, and c.
Counting Theory
The fundamental counting principle is a rule that is used to count the total number of possible outcomes in a given situation.
![Item 59 refers to the diagram of the building
below.
A boy stands 12 metres from the foot of the
building and observes the angle of elevation of
the top of the building.
田田田
田田田
田口田
1.6 m
12 m
19.
The height of the building is approximately
(A)
12 tan 40°
(B)
1.6+12 sin 40°
(C)
1.6+12 cos 40°
(D)
1.6+12 tan 40°
A boat was travelling on a bearing of 270°.
In what direction was it travelling?
52.
(A)
(B)
East
West
North
South](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fe273387a-5977-4cb2-9bd6-08596b45f661%2F3049d9ae-8fbb-4c50-8da0-d6c704108b6c%2F4wncdo1_processed.jpeg&w=3840&q=75)
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