Question

the sum of the first n term of an ap is 3n square + 4 and find the 25th term of this AP​

Answer 1

Answer:

Step-by-step explanation:

Given Sn = 3n2 + 4n,

S1 = 3×1 + 4×1 = 7,

S2 = 3×4 + 4×2 = 12 + 8 = 20,

Therfore First term a1 = 7 & Second term a2 = 20 - 7 = 13 and d

= 13 - 7 = 6.

Now 25th term an = 7 + ( 25 - 1) 6,

a25 = 7 + 24 x 6,

a25 = 151.

Hope it helps.

Answer 2

Answer:

25th term = 151

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Step-by-step explanation: