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. The sum of first n terms of an A.P. is 3n2 + 4n. Find the 25th term of this A.P.by only the formula of an =Sn-Sn-1
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Answer:
an= -149
Step-by-step explanation:
an=3n^2+4n-3 (n-1)^2-4 (n-1)
an= 3n^2+4n-3n^2-3 -6n-4n+4
an=1+6n
a=1+6×1
=7
a2=1+6×2
=13
d= 13-7
=6
a25=7+24×6
=7+144
=151
Answered by
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Answer:
25th term = 151
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