प. 3. प्रश्न 2. 1+ 5 + 7 + 9 + 11 का मान ज्ञात करने के लिए किस विकल्प का प्रयोग करेंगे?1 a.52 b. 62 / C. 52+3 d 62 - 3
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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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