Question

find the value of 1+3+5+7+9+11+13+15+17+19+21 without direct addition ? can you give step by step explanation pls​

Answer 1

Answer:

the value of direct addition of

115 is the answer

Step-by-step explanation:

for calculate them

Answer 2

Answer:

(i) 49 is the square of 7. Therefore it is the sum of 7 odd numbers. 49 = 1 + 3 + 5 + 7 + 9 + 11 + 13

(ii) 121 is the square of 11. Therefore it is the sum of 11 odd numbers 121 = 1 + 3 + 5 + 7 + 9 + 11 + 13 + 15 + 17 + 19 + 21

Step-by-step explanation:

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