9. a) The formula for the nth term of the sequence n(n+1)(2n+1) 1, 5, 14, 30, 55, 91,... is 6 Find the 20th term.

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter10: Sequences, Series, And Probability
Section10.1: Infinite Sequences And Summation Notation
Problem 32E
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9.
a) The formula for the nth term of the sequence
n(n+1)(2n+1)
1, 5, 14, 30, 55, 91,... is
Find the 20th term.
Transcribed Image Text:9. a) The formula for the nth term of the sequence n(n+1)(2n+1) 1, 5, 14, 30, 55, 91,... is Find the 20th term.
b) The nth term of the sequence 10, 17, 26, 37, 50, ... is (n+ 2)² +1.
Write down the formula for the nth term of the sequence 17, 26, 37, 50, 65,...
Transcribed Image Text:b) The nth term of the sequence 10, 17, 26, 37, 50, ... is (n+ 2)² +1. Write down the formula for the nth term of the sequence 17, 26, 37, 50, 65,...
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how (n+2)^2+1 became (n+1+2)^2

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