Question

B=2/3*5/6*9/10*....................*779/780

Answer 1

\(B=\frac{2}{3}.\frac{5}{6}.\frac{9}{10}...\frac{779}{780}\)

\(B=\frac{4}{6}.\frac{10}{12}.\frac{18}{20}...\frac{1558}{1560}\)

\(B=\frac{1.4}{2.3}.\frac{2.5}{3.4}.\frac{3.6}{4.5}...\frac{38.41}{39.40}\)

\(B=\frac{1.2.3...38}{3.4.5...40}.\frac{4.5.6...41}{2.3.4...39}\)

\(B=\frac{2}{39.40}.\frac{40.41}{2.3}\)

\(B=\frac{41}{39.3}=\frac{41}{297}\)

Answer 2

(2\(\hept{\begin{cases}2\\3\end{cases}}^5\))

Answer 3

41/297 k mk nha