Question

ans bata de bhai maths ka hai 10th ka​

Answer 1

Answer:

the first term=3,

the sum of first two terms=4,

the 2nd term=1,

the 10th term=-15 and

the nth term =5-2n..

Step-by-step explanation:

given, Sn=4n-n^2

S1=A1=4(1)-(1)^2=3...

S2=4(2)-(2)^2=8-4=4..

A2=S2-S1=4-3=1..

now, d=a2-a1=1-3=-2..

now 10th term,

a10=a+9d=3+9(-2)=3-18=-15...

also now nth term..

an=a+(n-1)d=3+(n-1)-2=3-2n+2=5-2n..