plzz anyone solve question 24.. plzz its urgent
Attachments:
Answers
Answered by
2
Sn=4n-n^2
If n=1
S1=4-1
=3=a1
If n=2
S2=8-4
=4=a1+a2
3+a2=4
a2=1
Then d=a2-a1
=1-3
= -2
a3=a+2d
= 3-4= -1
a10=a+9d=3-18= -15
an=a+(n-1)d=3+(n-1) -2
=5-2n
If n=1
S1=4-1
=3=a1
If n=2
S2=8-4
=4=a1+a2
3+a2=4
a2=1
Then d=a2-a1
=1-3
= -2
a3=a+2d
= 3-4= -1
a10=a+9d=3-18= -15
an=a+(n-1)d=3+(n-1) -2
=5-2n
Similar questions