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कोड ABCD अलग-अलग अंक 1–6 का उपयोग करता है। C=2D और A+C=B+D. दो अंकों की संख्या AB और CD में 24 का अंतर है, AB बड़ा है। A×C+B×D खोजें।

A13
B11
C15
D17
Answer & Solution
Correct answer: A. 13
C=2D डालने पर B=A+D आता है। फिर AB−CD=11A−20D=24. D=1,2,3 और विशिष्ट अंक 1–6 के साथ, केवल A=4,D=1 काम करता है। कोड 4521 और A×C+B×D=8+5=13 है।
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