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Doubt: I eliminated half of the possibility from $\binom{24}{2}$ to remove t₁>t₂ and got the answer as 2070.

Somebody, please explain why I am wrong and the solution is correct.

closed with the note: solved

closed | 8 views
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Due to those numbers are choosen but not arranged...

I mean you took that as combination but not as permutations.

If you take permutations then remove half of them, then you will get the correct answer
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Ans of ME is correct. Because here permutation or arrangement already given. U just need to select it or combine it
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I got it.

Thanks, @Shaik sir and @srestha ma'am