ધારો કે \((1+x)^{99}\)ના વિસ્તરણમાં \(x\)ની અયુગ્મ ઘાતોના સહગુણકોનો સરવાળો \(K\) છે. ધારો કે \(\left(2+\frac{1}{\sqrt{2}}\right)^{200}\) ના વિસ્તરણમાં મધ્યમ પદ ' \(a\)' છે. જો \(\frac{200_{C_99} K}{a}=\frac{2^\ell m}{n}\) હોય, જ્યાં \(m\) અને \(n\) અયુગ્મ સંખ્યાઓ હોય, તો ક્રમયુક્ત જોડ \((l, n )=..........\)

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.