Question

प्रश्न 2.1+5+7 +9+ 11 का मान ज्ञात करने के लिए किस विकल्प का प्रयोग करेंगे?1 a.5²b.6²c.5²+3d.6²-3 ​

Answer 1

Step-by-step explanation:

The right anwer of this question is option d. 6^2-3

Answer 2

Given :   1+ 5 + 7 + 9 + 11

To Find : Equivalent Value

5²

6²

5² + 3

6²  - 3

Solution:

1+ 5 + 7 + 9 + 11

Add and subtract 3

=  1+ 5 + 7 + 9 + 11  + 3 - 3

Rearrange the term

= 1 + 3 + 5 + 7 + 9 + 11   - 3

= (1 + 3 + 5 + 7 + 9 + 11) - 3

Sum of first n odd terms = n²

there are first 6 odd term  hence (1 + 3 + 5 + 7 + 9 + 11) = 6²

= 6² - 3

Hence  1+ 5 + 7 + 9 + 11  = 6² - 3

Correct answer is 6² - 3

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