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7 এর বর্গ এবং 6 এর বর্গের পার্থক্য কোন সংখ্যার সমান?

A13
B11
C12
D14
Answer & Solution
Correct answer: A. 13
n এর বর্গ এবং (n-1) এর বর্গের পার্থক্য হলো 2n মাইনাস 1, তাই n = 7 এর জন্য এটি 13।
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