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Question
a,b,c,d চারটি ক্রমিক স্বাভাবিক সংখ্যা হলে নিচের কোনটি পূর্ণবর্গ সংখ্যা ?
abcd
ab +cd
abcd +1
abcd-1
ANSWER : 3
Descrption
<p>Let mean, a = 1</p> <p><span class = "Apple - tab - span" style = "white - space: pre;"> </span>b = 2</p> <p><span class = "Apple - tab - span" style = "white - space: pre;"> </span>C = 3</p> <p><span class = "Apple - tab - span" style = "white - space: pre;"> </span>d = 4</p> <p>Now, abcd = 1× 2×3×4</p> <p><span class = "Apple - tab - span" style = "white - space: pre;"> </span> = 24 (it us not correct)</p> <p>ab + cd = 1×2 + 3×4</p> <p><span class = "Apple - tab - span" style = "white - space: pre;"> </span> = 14(not correc)</p> <p>abcd + 1 = 24 + 1</p> <p><span class = "Apple - tab - span" style = "white - space: pre;"> </span> = 25 (which is correct)</p> <p>Ans: c</p>
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