Section Solutions
ΒΆSequences-
Write the first five terms of the sequence in simplest form.
113,93,73,53,β¦
1,β22,0,ββ22,β1,β¦
52,114,298,β¦
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Write a formula for each sequence. I.e. xn=___ for n=1,2,3,β¦.
xn=3n5nβ―
(β1)nβ―
(β1)n+1nn+1β―
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What is the least upper bound and the greatest lower bound? Prove it.
GLB = 0, LUB = 2
GLB = 2/3 , LUB = 9/7
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Is the sequence monotonic or not? Prove it.
decreasing
not monotonic
increasing
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Use limits to find whether or not the sequence converges.
converges to 0
converges to 1
converges to 0
converges to eβ1
N = 3001
N = the first positive integer larger than 32Ο΅
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List, in simplest form, the first three partial sums for the series and write a formula for the Nth partial sum.
1,43,139,4027,β¦,Sn=1β3n+11β313n=1β(13)n+11β13
3,365,33125,β¦,Sn=31β5n+1(1β5)5n=31β(15)n+11β15
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What does the geometric series converge to?
1
9
ββn=353n=53ββn=31n>ββn=31n which diverges
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Apply the integral test to determine if the series converges.
converges
diverges
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Determine if these series converge via one of the nth term test, integral test, p-series test, comparison test, or limit comparison test.
converges by limit comparison with 1n2
converges by limit comparison with 1n2
diverges, nth term test
converges, geometric series
diverges, nth term test
separate the two series, one harmonic (diverges), one geometric (converges)
separate the two series, both geometric (converges)
separate the two series, one constant (diverges by nth term test), one converges by integral or p-series test
limit comparison with 1n2
converges, geometric series
limit comparison with 1n3
limit comparison with 1βn
converges by limit comparison with 1n2
converges by comparison to 1n2
converges by limit comparison with 1n
converges by comparison to 1n2
converges by comparison to 1n2
converges by limit comparison with 13n
converges by comparison to 1n2
converges, integral test
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Determine whether the alternating series is convergent or divergent.
converges
converges
diverges, terms don't tend to zero
diverges, rewrite it so that you can see that an=(5/3)n
converges
converges
diverges
diverges
converges
converges
diverges, terms don't tend to zero
converges, rewrite it without a trig function
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Conditionally Convergent, Absolutely Convergent, or Divergent?
D
CC
AC, to get absolutely convergent, convert log4 to ln and use integral test
AC
D
AC, ratio test + that clever natural log trick for limits
D
CC
AC
CC
this is a neat problem
this is a really neat problem
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Intervals of convergence.
(β1,1)
(β4,4)
(β1/3,1/3)
(2,8)
(β1,1)
(β1,1)
no interval, diverges for all xβ β3
no interval, diverges for all xβ 0
(β8,0)
(β1,1)
this is a neat problem
(1,3)
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Taylor Series (just the first few terms)
β1+2(xβ1)β3(xβ1)2+4(xβ1)3β5(xβ1)4+6(xβ1)5
2xβ8x3/3!+32x5/5!β128x7/7!β¦
3+3ln(3)(xβ1)+32(ln(3))2(xβ1)2+12(ln(3))3(xβ1)3+18(ln(3))4(xβ1)4+ 140(ln(3))5(xβ1)5
e2+e2(xβ2)+12e2(xβ2)2+16e2(xβ2)3+124e2(xβ2)4+1120e2(xβ2)5
βx+Ο2+16(xβΟ2)3β1120(xβΟ2)5
xβ12x2+13x3β14x4+15x5
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Use multiplication, substitution, differentiation, and integration whenever possible to find a series representation of each of the following functions.
ββn=0(β1)nx2(n+1)(2n)!
ββn=0(β1)nx4n+1(2n+1)!
5ββn=03nn!xn+1
2ββn=0(nβ1)rn You know the series for 11βr.