6.Permutation and Combination
medium

સમીકરણ $x+y+z=21$, જ્યાં $x \geq 1, y \geq 3, z \geq 4$, ના પૂર્ણાંક ઉકેલોની સંખ્યા $..........$ છે.

A

$104$

B

$105$

C

$103$

D

$102$

(JEE MAIN-2023)

Solution

${ }^{15} C _2=\frac{15 \times 14}{2}=105$

Standard 11
Mathematics

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