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Manakah peristiwa berikut yang memiliki peluang paling besar jika dipilih satu mahasiswa dari mahasiswa yang memiliki tahun lahir yang sama? (PK UTBK 2021)
A. 3 orang dari 25 Mahasiswa memiliki tahun lahir yang sama
B. 5 orang dari 15 Mahasiswa memiliki tahun lahir yang sama
C. 6 orang dari 15 Mahasiswa memiliki tahun lahir yang sama
D. 5 orang dari 25 Mahasiswa memiliki tahun lahir yang sama
E. 6 orang dari 25 Mahasiswa memiliki tahun lahir yang sama
Jawabannya: C
Soal 5. Dari angka-angka 1, 2, 3, dan 5 akan disusun bilangan yang terdiri dari 6 angka dengan syarat angka 3 dan 2 boleh muncul dua kali. Banyak bilangan yang terbentuk ialah (PK UTBK 2022)
A. 60
B. 120
C. 180
D. 360
E. 720
Jawabannya: C
Soal 6. Earthquake is any sudden shaking of the ground caused by the passage of seismic waves through Earth’s rocks. Seismic waves are produced when some form of energy stored in Earth’s crust is suddenly released, usually when masses of rock straining against one another suddenly fracture and “slip.”
Earthquakes occur most often along geologic faults, narrow zones where rock masses move in relation to one another. The major fault lines of the world are located at the fringes of the huge tectonic plates that make up Earth’s crust.
Little was understood about earthquakes until the emergence of seismology at the beginning of the 20th century. Seismology, which involves the scientific study of all aspects of earthquakes, has yielded answers to such long-standing questions as why and how earthquakes occur.
About 50,000 earthquakes large enough to be noticed without the aid of instruments occur annually over the entire Earth. Of these, approximately 100 are of sufficient size to produce substantial damage if their centers are near areas of habitation. Very great earthquakes occur on average about once per year. Over the centuries they have been responsible for millions of deaths and an incalculable amount of damage to property.
