Combining Two Sums
Difficulty: Easy · Topics: Algebra, Series
Ikki yig‘indini birlashtirish
For sequences \a n\ and \b n\,
Σ n=1^10(2a n-b n)=7, Σ n=1^10(a n+b n)=5.
Find Σ n=1^10(a n-2b n).
\a n\ va \b n\ ketma-ketliklar uchun
Σ n=1^10(2a n-b n)=7, Σ n=1^10(a n+b n)=5.
Σ n=1^10(a n-2b n) ni toping.