Z. W. Sun, V. J. W. Guo and C. Krattenthaler proposed several
conjectures about arithmetic properties of binomial coefficients.
In this paper, we aim to give new results for these conjectures or
their extensions. In particular, we partially solve a conjecture of
Z. W. Sun.
Key Words: Binomial coefficient, -adic valuation,
greatest common divisor, congruences.