Question

which of the formula to find sum of all odd numbers​

Answer 1

Answer:

The sequence of first n odd numbers is

1,3,5,7.........n

This forms an A.P with a=1 and d=2

S=

2

n

{2a+(n−1)d}

⇒S=

2

n

{2(1)+(n−1)2}

⇒S=

2

n

(2n)

⇒S=n

2

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