Context for question 10The 7th term of an arithmetic progression is 77. The sum of the first n terms of the progression is denoted by Sn. It is given that S11=880.
10(a)Arithmetic Geometric SeriesHard4 marksFind the 20th term of the progression.Show your methodTypeWriteMath0 wordsFirst term a and common difference d20th termGrade answerSolutionGrading criteria
10(b)Arithmetic Geometric SeriesHard4 marksFind the smallest number of terms, N, such that SN<50.Show your methodTypeWriteMath0 wordsNGrade answerSolutionGrading criteria