Question

q1. without adding find the sums . 1. 1+3+5+7+9. 2.1+3+5+7+9+11+13+15+17+19.​

Answer 1

Answer:

1- 25

2-100

Step-by-step explanation:

1. -- 1+3+5+7+9. (total numbers are 5)

so, the square of 5 is 25

so, the answer is 25

2.-- 1+3+5+7+9+11+13+15+17+19. (total numbers are 10)

so, the square of 10 is 100

so, the answer is 100

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Answer 2

Step-by-step explanation:

1. total odd numbers =n=5

.: sum= n2=5×5=25

2. total odd numbers =n= 10

.: sum=n2=10×10=100

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