Question

Find the value of 1+3+5+7+...............+25= ​

Answer 1

Answer:

1+3+5+7+9+11+13+15+17+19+21+23+25 = 169 = 13²

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Answer 2

Answer:

An=a+(n-1)d

25=1+(n-1)2

24/2=n-1

n-1=12

n=13...

Step-by-step explanation:

Sn=n/2(a+An)

Sn=13/2(1+25)

Sn=13×13

Sn=169...