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निम्नलिखित प्रश्न में दिए गए विकल्पों में से विषम संख्या युग्म को चुनिए :
A. `5-35`
B. `6-42`
C. `8-64`
D. `11-77`

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Correct Answer - C
संख्या-युग्म `8 - 64 ` में दूसरी संख्या, पहली संख्या की पूर्ण वर्ग है। फिर, दोनों संख्याएँ पूर्ण घन भी हैं।
`8 to (8)^(2)=64`
`8=(2)^(3), 64=(4)^(3)`
अन्य सभी संख्या-युग्मों में, दूसरी संख्या, पहली संख्या की सात गुनी है।
`5xx7=35`
`6xx7=42`
`11xx7=77`

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