PnC

[stiff onyx]

how do I part (b)?

[vagrant yew]

<@&1227988399579730072>

Note for OP

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[whole hamlet]

Making cases is a way ig

Like three digits used twice, one used thrice, another used thrice

and then one used four times one twice

So 3 cases

But yeah there could be another way 🤷‍♂️

[stiff onyx]

won't it take a lot of time tho?

[whole hamlet]

2 digits thrice ke liye 5c2.6c3
3 digits twice ke liye 5c3.6c2.4c2
1 4 times, other twice ke liye 5c2.2c1.6c4

Add 'em up

and done