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Find x if (x\(_4\))\(^2\) = 100100\(_2\)

Mathematics
JAMB 1983

Find x if (x\(_4\))\(^2\) = 100100\(_2\)

  • A. 6
  • B. 12
  • C. 100
  • D. 210
  • E. 110
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Correct Answer: Option B
Explanation

x\(_4\) = x \(\times\) 4\(^0\) = x in base 10.

100100\(_2\) = 1 x 2\(^5\) + 1 x 2\(^2\)

= 32 + 4

= 36 in base 10

\(\implies\) x\(^2\) = 36

x = 6 in base 10.

Convert 6 to a number in base 4.

4 6
4 1 r 2
  0 r 1

= 12\(_4\)


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Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
WAEC and NECO CBT App for Mobile Devices - Candidates, Schools, Centres, Resellers - 100% Offline -Download Now
Post UTME Past Questions Agent
WAEC and NECO CBT Software for Computers and Laptops - Candidates, Schools, Centres, Resellers - 100% Offline -Download Now
Your School's Whatsapp Group - Join Us now
WAEC and NECO CBT Software for Computers and Laptops - Candidates, Schools, Centres, Resellers - 100% Offline -Download Now
WAEC and NECO CBT App for Mobile Devices - Candidates, Schools, Centres, Resellers - 100% Offline -Download Now
Post UTME Past Questions Agent
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts