Question

find n if 1 + 3 + 5+ 7 +...
upton n term =225​

Answer 1

Answer:

here, a=1

d=3-1=2

Tn=225

Formula : Tn= a+(n-1)d

225= 1 + ( n-1 ) 2

225= 1 + 2n-2

225= 2n-1

2n=226

n=113