The nth term of any arithmetic progression in 4n-3 find the 15th term

 

solution:-Given that

  an=4n-3(an nth term of AP)

 a15=4✕15-3

   =60-3

   =57 ans

If an=3+4n then find the 4 th term of AP. 

Ans:- Given that

an=3+4n

a4=3+4×4

a4=3+16

a4=19

the 4 th term of AP=19 . 

✳️What is the nth term of AP ? 

Ans:- an=a+(n-1)d

✳️Sum of nth term of AP, 

Sn=n/2{2a+(n-1)d}

Or, Sn=n/2{a+a+(n-1)d}

Or, Sn=n/2{a+an}