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Without Doing the Actual Addition, Find the Sum Of: 1 + 3 + 5 + 7 + 9 + ……………… + 39 + 41 - Mathematics

Sum

Without doing the actual addition, find the sum of:

1 + 3 + 5 + 7 + 9 + ……………… + 39 + 41.

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Solution

1+3 + 5 + 7 + 9 + ……….. + 39 + 41

= Sum of first 21 odd natural numbers = 212 = 441

Concept: Properties of Square Numbers
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APPEARS IN

Selina Concise Mathematics Class 8 ICSE
Chapter 3 Squares and Square Root
Exercise 3 (C) | Q 13.2 | Page 45
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