Without adding, find the sum of 1 + 3 + 5 + 7 + 9.
16
9
36
25
The sum of first n consecutive odd numbers starting from 1 is given by then2. So, 1+3+5+7+9=52 as n=5. ⟹1+3+5+7+9=25
Question 7 (i) Without adding, find the sum:
1 +3 + 5+7 + 9
Without adding, find the sum: 1+3+5+7+9
Without adding, find the sum of 1+3+5+7+9