find the first term a and the common difference d A.P.-5,-1,3,7,_____solved the sum
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a= -5
d= a2 - a1
= -1 - (-5)
= -1 + 5
= +4
d = 4
d= a2 - a1
= -1 - (-5)
= -1 + 5
= +4
d = 4
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