KVPY Government Jobs Exams

Let S = {1, 2, 3, .., 40} and let A be a subset of S such that no two elements in A have their sum divisible by 5. What is the maximum number of elements possible in A ?
option
(A) 10
(B) 13
(C) 17
(D) 20

Read Solution (Total 0)

KVPY Other Question

How many ordered pairs of (m, n) integers satisfy ?
m/12=12/n A clay ball of mass m and speed v strikes another metal ball. of same mass m, which is at rest. They stick together after collision. The kinetic energy of the system after collision is