6.Permutation and Combination
medium

समीकरण $\mathrm{x}+\mathrm{y}+\mathrm{z}=21$, जहाँ $\mathrm{x} \geq 1, \mathrm{y} \geq 3, \mathrm{z} \geq 4$ हैं, के पूर्णांकीय हलों की संख्या है___________.

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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