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makkiz [27]
2 years ago
9

1+3+5+7+9+11+13+15+17+19+21 without adding

Mathematics
2 answers:
lubasha [3.4K]2 years ago
7 0

Answer:

121

Step-by-step explanation:

It's a series of odd numbers. Let

S _{11} =  1+3+5+7+9+11+13+15+17+19+21

As a rule of thumb, the sum of n numbers of odd numbers is equal to n². There're 11 numbers in this series. Hence The sum is 11² =121

alexgriva [62]2 years ago
3 0

Answer:

121

Step-by-step explanation:

1 + 3 + 5 + 7 + 9 + 11 +  13 + 15 + 17 + 19 + 21 is a sum of first 11 odd numbers.

   \sf \boxed{\text{\bf Sum of first n odd numbers = $n^2$}}

Here, n is the number of terms.

In this sequence, there are 11 terms.

Sum of first 11 odd numbers = 11²

                                              = 11 *11

                                              = 121

 

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