Question

Please give answer for the question given above...
NOTE → No need of irrelevant answers ! ​

Answer 1

Answer:

1.a) Solution:- a= 1

d=2-1

=1

Sn= n/2[2a+(n-1)d]

= 10/2[2×1+(10-1)1]

= 5[2+9]

= 5[11]

= 55

So, Sn=55

I don't know the second one..sorry..

Answer 2

Answer:

HERES YOUR ANSWER

Step-by-step explanation:

HOPE IT HELPS U DEAR

SORRY I ALSO DONT KNOW THE SECOND THEORY