Question

1) Without adding find the sum of :

1+3+5+7+9+11+13+15+17=?

2) Write any two properties of parallelogram

3) find the square root of 1296 by prime factorisation.​

Answer 1

Answer:

1) as we know that the total odd numbers here are 9 so

n= 9

n²= 9×9

ans = 81

2):-( i)opposite sides of a parallelogram are congruent

(ii) diagonals of parallelogram bisects each other

3) prime factors of 2196 are 2×2×2×2×3×3×3×3 and we can pair them as

2×2 and 2×2 and 3×3 and 3×3

now we will bring one digit from these pairs like 2×2×3×3 = 36

so the square root of 2196 =36

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Answer 2

Answer:

1+3+5+7+9+11+13+15+17= 81