find the sum of first 17 term of an AP whose 4 and 9 term is -15 and -30 respectively
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Answer:
a+3d = –15....(i)
a+8d = –30....(ii)
apply (ii) – (i), we get
5d = –15
d = –3
putting value of d in (i),
a+3(–3) = –15
so, a = –15+9 = –6
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