Question

Find the sum of the following without actual addition: -
i) 1+3+5+7+9+...+53
ii) 1+ 3+5+7+9+...+31​

Answer 1

Answer:

1 is 28 and 2 is 6

if 1+3+5+7+9=25

53-25=28

so, 1+3+5+7+9=25

31-25=6

so, 28 and 6 is answer