if an ap is the common difference is equal to minus 4 and the 7 term is 4 find the first term
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if d=-4
a7= 4
therefore,
a+6d=4
a-24=4
a=28
therefore the first term is 28.
a7= 4
therefore,
a+6d=4
a-24=4
a=28
therefore the first term is 28.
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