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What is the 51st term of the sequence below? -7,2,11,20 What is the 22nd term of the sequence below? -9,-3,3,9
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What is the 51st term of the sequence below? -7,2,11,20 What is the 22nd term of the sequence below? -9,-3,3,9
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Jun 26, 2017
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What is the 51st term of the sequence below?
-7,2,11,20
What is the 22nd term of the sequence below?
-9,-3,3,9
Mathematics
high-school
Rishabh Poddar
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Rishabh Poddar
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first determine whether arithmetic sequence or geometric
both seem to be arithmetic
first one
adds 9
starts with -7
an=a1+(n-1)d
a1=first term
d=common difference
an=-7+9(n-1)
51 term is
a51=-7+9(51-1)
a51=-7+9(50)
a51=-7+450
a51=443
51term is 443
adds 6 every times
starts with -9
an=-9+6(n-1)
22nd term
a22=-9+6(22-1)
a22=-9+126
a22=117
22nt term is 117
Kbvishnu
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Jul 2, 2017
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Kbvishnu
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