Math, asked by devesh247, 4 months ago

3. Without actual adding, find the sum of:
(a) 1 + 3 + 5 + 7 + 9 + 11 + 13
(b) 1 + 3 + 5 + 7 + 9 + 11 + 13 + 15 + 17 + 19 + 21

Answers

Answered by XxZeeshanarshiALLHA

3

Answer:

A) answer is 49

b) answer is 121

Answered by usernametaken8

1

Step-by-step explanation:

Using property,

Sum of n odd integers is equal to n²

a) 1+3+5+7+9+11+13 = 7² = 49

b) 1+3+5+7+9+11+13+15+17+19+21 = 11² = 121

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