Question

Answer it please let me know about it

Answer 1

HOPE THIS HELPS YOU

Answer 2

3,9,15,21............99

an=a+(n-1 )d

99=3+6n-6

99=6n-3

6n=99-3

n=96/6

n=16

sn =n/2(2a+(n-1)d)

put the value

then u get the answer

Is it right or wrong plss comment me

thank u