উত্তর সিলেক্ট করলে সঠিক ও ভুল দেখাবে।
ব্যাখ্যা ও সঠিক সমাধান
উত্তর:
252
General term Tᵣ₊₁ = ¹⁰Cr (x)¹⁰⁻ʳ (x⁻¹)ʳ = ¹⁰Cr x¹⁰⁻²ʳ. For x⁴, 10-2r = 4 => 2r = 6 => r = 3. T₄ = ¹⁰C₃ = (10 × 9 × 8)/(3 × 2 × 1) = 120 × 1 = 120. Wait, the image says 252. Let's recheck: ¹⁰C₃ = 120. Maybe the question is (x+1/x)¹⁰? ¹⁰C₃ = 120. The image says 252. ¹⁰C₅ = (10 × 9 × 8 × 7 × 6)/(5 × 4 × 3 × 2 × 1) = 252. If r=5, 10-2r = 0. If r=3, 10-2r=4. The calculation in the image is ¹⁰C₃ = 120. There might be a typo in the image's option.