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^{20}C_2+(30×20) = x

Solve and get ans

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What means ‘20C2’ ? What is ‘C’

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“C” means Combination.

And ^nC_r means to choose r elements from n elements.

And ^{20}C_2 is the number of ways you can choose 2 elements from 2 elements.

^nC_r=\frac{n!}{r!(n-r)!}

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Thanks a lot to ib-Rahman_010 and ROHAN1230 ! I couldn’t find any way to solve it. But I have solved it by you all’s hint.

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