In an arithmetic sequence, the first term is -8 and the sum of the first 20 terms is 790. a Find the common difference. bi Find 28- ii Hence, find S28 c Find how many terms it takes for the sum to exceed 2000.
In an arithmetic sequence, the first term is -8 and the sum of the first 20 terms is 790. a Find the common difference. bi Find 28- ii Hence, find S28 c Find how many terms it takes for the sum to exceed 2000.
Chapter12: Sequences, Series And Binomial Theorem
Section12.2: Arithmetic Sequences
Problem 12.32TI: Find the nineteenth term of a sequence where the fifth term is 1 and the common difference is -4....
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Transcribed Image Text:In an arithmetic sequence, the
first term is -8 and the sum of
the first 20 terms is 790.
a Find the common difference.
bi Find
128⁰
ii Hence, find S28²
c Find how many terms it takes
for the sum to exceed 2000.
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