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Mathematics
Arithmetic Sequences
Finding the first term and common difference
The sum of the third and ninth terms of an arithmetic sequence is 20 the difference between the twelfth and fourth term of the arithmetic sequence is 32 determie the value of the first term and the value of d
1 answer
a+11d - (a+3d) = 32
d=4
now find a using
a+2d + a+8d = 20
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