ap p5=17,D=8 find the first term ?
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the first term is -15
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a=?, d=8, a5=17
a+4d=17
a+4*8=17
a+32=17
a=17-32= (-15)
a+4d=17
a+4*8=17
a+32=17
a=17-32= (-15)
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