વર્ગો 49 અને 36 વચ્ચેનો તફાવત કેટલો છે?
A13
B12
C11
D14
Answer & Solution
Correct answer: A. 13
ક્રમિક વર્ગો n² અને (n-1)² વચ્ચેનો તફાવત 2n - 1 થાય છે, જે n = 7 માટે 13 છે.
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