Aspire Faculty ID #15206 · Topic: JAMIA MCA 2017 · Just now
JAMIA MCA 2017

If $(2?1)_7 = (120)_{10}$, then the missing digit is

Solution

$2\times7^2 + ?\times7 + 1 = 120$ $\Rightarrow 99 + 7? = 120 \Rightarrow ? = 3$.
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