In an AP fourth term is -13/2, 17th term is zero
and last one is 21. Find the first term.
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Step-by-step explanation:
Given:
a4= a+3d
=-13/2
a17=a+16d
=0
l=21
Now, subtract these
a+16d=0
a+3d=-13/2
13d=13
d=1/2
put d=1/2 in a+3d,we get
a+3(1/2)=-13/2
a=-8
Hence,first term is -8