The sum of 'n'terns of an AP is
3n square +5n.The mth term of the AP is 164 find the value of m
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3n^2+5n
put n=1,2,3,4.....
3×1^2+5×1
sn=8
s2=22
s3=52
t1=a=8
t2=22-8
t2=14
t3=42-22
t3=20
d=14-8=6
tm=a+(m-1)d
164=8+(m-1)6
164-8=6m-6
156+6=6m
162=6m
m=27
3n^2+5n
put n=1,2,3,4.....
3×1^2+5×1
sn=8
s2=22
s3=52
t1=a=8
t2=22-8
t2=14
t3=42-22
t3=20
d=14-8=6
tm=a+(m-1)d
164=8+(m-1)6
164-8=6m-6
156+6=6m
162=6m
m=27
Answered by
0
there is no term exist
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shrinidhis007:
I think question is incorrect..
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