\(X-\)અક્ષ,\(Y-\)અક્ષ અને રેખા \(3 x+4 y=60\) દ્વારા એક ત્રિકોણ બનાવવામાં આવે છે. તો, જો \(a\) પૂર્ણાંક હોય અને \(b\) એ \(a\) નો ગુણિત હોય ત્યારે ત્રિકોણની અંદર જ આવે તેવા બિંદુઓ \(P ( a , b )\) ની સંખ્યા \(.............\) છે.

A \(31\)
B \(30\)
C \(28\)
D \(56\)

Verified Solution

Answer & Solution

Correct Answer

(A) \(31\)

Step-by-step Solution

Detailed explanation

If \(x=1, y=\frac{57}{4}=14.25\) \((1,1)(1,2)-(1,14) \quad \Rightarrow 14\) pts. If \(x =2, y =\frac{27}{2}=13.5\) \((2,2)(2,4) \ldots(2,12) \quad \Rightarrow 6\) pts. If \(x=3, y=\frac{51}{4}=12.75\) \((3,3)(3,6)-(3,12) \quad \Rightarrow 4\) pts. If \(x=4, y=12\)…

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.

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