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sequence and series arithmetic (1 Viewer)

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shell.q

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term7= 20
term13=38
find the common difference and the first term.
solve simultaneous right?
if anyone can give me the first few steps with the working out would be much aprecciated please =]
 
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Bacchus

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shell.q said:
term7= 20
term13=38
find the common difference and the first term.
solve simultaneous right?
if anyone can give me the first few steps with the working out would be much aprecciated please =]
Click to expand...
7th term: a + 6d = 20
13th term: a + 12d = 38

6d = 18
d = 3
a = 2
 
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