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Unit 5 · Reasoning & Mental Ability HTET 2022 Level-1 (PRT)

Some equations are solved on the basis of a certain system. On the same basis, find the correct answer for the unsolved problem :
If 6241 = 9, and 3732 = 20, then 4523 is equal to :
कुछ समीकरण एक विशेष प्रणाली के आधार पर हल किए गए हैं। इसी आधार पर, अनुत्तरित समीकरण का सही उत्तर ज्ञात कीजिए :
यदि 6241 = 9, तथा 3732 = 20 हो, तो 4523 बराबर है :

Pick an option to check yourself, or open the answer below.

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Correct answer: C. 21

Explanation

For digits a b c d the rule is (a × b) + d − c. Check: 6241 → 6×2 + 1 − 4 = 9; 3732 → 3×7 + 2 − 3 = 20. So 4523 → 4×5 + 3 − 2 = 21.अंक a b c d के लिए नियम है (a × b) + d − c। जाँच: 6241 → 6×2 + 1 − 4 = 9; 3732 → 3×7 + 2 − 3 = 20। अतः 4523 → 4×5 + 3 − 2 = 21।

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