Question

Please answer 15,17,21-29
And please tell how
I will mark you as brainliest

Answer 1

Answer:

15)c)61

(Multiples of 4 : 4,8,12,16,20 are added)

17)c)116

(Multiples of 11 are added)

21)b)25

(5+(1),6+(1+2),9+(1+2+3+,....))

22)b)13

(Prime nos)

23)36

(Square nos of 1,2,3...)

24)121

(Square of odd nos)

25)64

26)324

27)108

28)180

29)17 1/2