Question
If,${ }^{12} C_{5}+2 .{ }^{12} C_{4}+{ }^{12} C_{3}={ }^{14} C_{r}$, then find the value of $r$.
Step 1
{ }^{12} C_{4}+{ }^{12} C_{3}={ }^{14} C_{r}$. We can rewrite this as ${ }^{12} C_{5}+{ }^{12} C_{4}+{ }^{12} C_{4}+{ }^{12} C_{3}={ }^{14} C_{r}$. Show more…
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