Question

(iii) 1.3+3.5+5.7+... sum of n of progression​

Answer 1

Answer:

1.3+3.5+5.7........(2n-1)(2n+1)

Step-by-step explanation:

nth term of ap 1,3,5 =a+(n-1)d

a=1 d=2

1+(n-1)2

= 1+2n-2

=2n-1

nth term of ap 3,5,7

=a+(n-1)d

= a=3 d=2

=3+(n-1)2

=3+2n-2

= 2n+1

hence nth term of 1.3+3.5+5.7.......(2n+1)(2n-1)

mark me as brainliest if it helped

Answer 2

Answer:

Nhi ho raha....

thank you