Question

Without adding, find the sum of the following numbers
(i) 1+3+5+ 7 + 9 =
(ii) 1+3+5+ 7 + 9 + 11 + 13 + 15 + 17 =
(iii)1+3+5+7+9+ 11 + 13 + 15 + 17 + 19 +21 +23 + 25 =​

Answer 1

Answer:

The sum of first 'n' odd no.s is equal to 'n²'.

(i) 1+3+5+7+9 = (5)² = 25

(ii) 1+3+5+7+9+11+13+15+17 = (9)² = 81

(iii)1+3+5+7+9+11+13+15+17+19+21+23+25=(13)²=169

Answer 2

Answer:

(I) 5²(ii)9² (iii)13²

Step-by-step explanation:

25,81,169