Question
${}^n\mathrm{C}_{2}=45$ હોય તો $n$ ની કિંમત શોધો.
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| વર્ગ | $0 - 4$ | $5 - 19$ | $20 - 29$ | $30 - 54$ | $55 – 70$ |
| આવૃત્તિ | $5$ | $10$ | $15$ | $8$ | $2$ |
| ચલ $x$ | $1,500$ | $800$ | $200$ |
| ભાર $w$ | $5$ | $4$ | $1$ |
| ગુણ | $20-30$ | $30-40$ | $40-50$ | $50-60$ | $60-70$ | $70-80$ |
| વિદ્યાર્થીઓની સંખ્યા | $8$ | $20$ | $35$ | $60$ | $45$ | $10$ |