Friday, 15 December 2017

(geometry) Q. 2].         Consider a ∆ PQR with a point A within the ∆ .Lines PA, QA, and RA intersect the opposite side s in points DEF respectively.
PROVE THAT out of the numbers PA/AD, QA/AE, RA/AF, at least one is ≤2 and at least one is ≥2.


post your solution in the comments .
Thank you.

pigeonhole principal

Prove that any sequence of nm + 1 distinct real numbers either contains an increasing subsequence of length n + 1 or a decreasing subsequen...