In an AP the sum of its first terms is 3n²/2 + 13n/2. Find its 25th term.
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Answered by
3
Answer:
formula
tn=a+(n-1)×d
25=9+(25-1)×1
25=9+24×1
25=33
tn=33-25
tn25=8
the 25th term of an AP is 8
Answered by
1
Answer:
25th term=3×25×25/2+13×25/2
=3×625/2+13×25/2
=1875/2+325/2
=2200/2
=1100=25th term of A. P.
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