alleryযদি 7-অংকৰ সংখ্যা 5432y71, 9 ৰে বিভাজ্য হয়, তেন্তে y ৰ একক-অংকৰ মান কিমান?
A5
B6
C7
D4
Answer & Solution
Correct answer: A. 5
এটা সংখ্যা 9 ৰে বিভাজ্য হয় যদি আৰু কেৱল যদিহে ইয়াৰ অংকবোৰৰ যোগফল 9 ৰে বিভাজ্য হয়।
অংকবোৰৰ যোগফল = 5 + 4 + 3 + 2 + y + 7 + 1 = 22 + y।
22 + y, 9 ৰে বিভাজ্য হ'বলৈ হ'লে, 22 তকৈ ডাঙৰ বা সমান 9 ৰ নিকটতম গুণিতকটো হ'ল 27।
22 + y = 27 => y = 5।
যিহেতু y এটা একক অংক (0 <= y <= 9), সেয়েহে y = 5 হৈছে একমাত্ৰ বৈধ মান।
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