Question

please answer this question now only fastly because I want to write now don't answer idiotly​

Answer 1

Answer:

common difference =2

a=1

n=10

Sn=n/2(2a+(n-1)d)

====10/2(2×1+18)

====5×20

====100

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Answer 2

We know that,

Sum of first n odd numbers=n²

There are ten odd numbers in the given question.

So,

n²=10²=100

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