Math, asked by karanchauhan9066, 8 months ago

The sum of n terms of an A.P. is 3n2+ 5n. Find the A.P. Hence find its 15th term

Answers

Answered by Mansimehra23109

1

Answer:

15th term 11

Step-by-step explanation:

ap is 11+11+11+11+...

Answered by Patel123456

5

Answer: T15=204

Step-by-step explanation: Sn = 3nsquare+5n

T1=S1=3x1square+5x1=3+5=8

S2=3x2square+5x2=12+10=22

T2=S2-S1=22-8=14

Common difference=T2-T1=22-8=14

Now,

A.P is a,a+d,a+2d,a+3d.........

A.P is 8,22,36,50.........

Tn=a+(n-1)d

T15=8+(15-1)14

T15=8+196

T15=204

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