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Adding Consecutive Odd Numbers

Find the sum ...

Question

Find the sum of 1 + 3 + 5 + 7 + 9, without performing the actual summation.

A

15

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B

64

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C

21

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D

25

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Solution

The correct option is D 25

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Similar questions

Q. Without doing actual addition, find the sum of:

1 + 3 + 5 + 7 + 9 + \dots + 51 + 53

Without adding, find the sum of $1 + 3 + 5 + 7 + 9$

Q. Find the sum of 1 + 3 + 5 + 7 + 9 + 11 + 13 + 15 + 17 +19, without performing each term addition.

Q. Find the sum of the following numbers without actually adding the number
a) 1+3+5+7+9+11+13+15
b) 1+3+5+7

Find the sum without actually adding it.

$1 + 3 + 5 + 7 + 9 + 11 + 13 + 15 + 17 + 19 + 21$

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