Home › JEE Main › Mathematics › JEE Main 2023 Mixed › Number of ways to choose 4 students from class o…
Number of ways to choose 4 students from class of 10 if 2 specific students must be included:
A28 (= C(8, 2) — choose remaining 2 from 8)
B45
C30
DC(10,4) = 210
Answer & Solution
Correct answer: A. 28 (= C(8, 2) — choose remaining 2 from 8)
2 students fixed in, choose 2 more from remaining 8: C(8, 2) = 28.
Related questions
In the photoelectric effect, the kinetic energy of ejected electrons is:The electronic configuration of Cr (Z=24) is an exception, written as:By the AUFBAU principle, the 3d subshell starts filling:Hund's rule states that electrons in degenerate orbitals:Heisenberg's uncertainty principle is most accurately stated as:The de Broglie wavelength of a particle with momentum p is:The BALMER series of hydrogen corresponds to electron transitions ending at:The energy of the nth orbit in a hydrogen atom (Bohr's model) is: