Question

Plz explain these questions (7 & 8) with proper explanation!​

Answer 1

Answer:

i can tell only 8th one sorry !!

Step-by-step explanation:

you should first take the divisibles of 4 which are two digits and then you have to add them and you have to add 3 in that sum so that the remainder will be three

Answer 2

Answer:

(7)

a8=a+7d=41

a13=a+12d=61

Solving two equations we get,

d=4

a=13

a19=a+18d=13+4×18=85

S19=19/2(13+85)

=931

(8)

a=11

d=4

an=99

an=a+(n-1)d

99=11+(n-1)4

88/4=n-1

22=n-1

n=23

S23=23/2(11+99)

=1265