First and Last Three Terms
Difficulty: Easy · Topics: Algebra, Sequences
Birinchi va oxirgi uchta had
The arithmetic sequence \a n\ satisfies the following conditions.
a 1+a 2+a 3=159, a m-2+a m-1+a m=96
and Σ k=1^ma k=425 where m is a natural number, m 3. Find the value of a 11.
\a n\ arifmetik progressiya quyidagi shartlarni qanoatlantiradi.
a 1+a 2+a 3=159, a m-2+a m-1+a m=96
va Σ k=1^ma k=425, bunda m — natural son, m 3. a 11 ning qiymatini toping.