Question 130

$$10^3 * 100^3 + 999999999 = 10^? + 10^?$$

Solution

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$$10^3*10^6 +999999999 \approx 10^?+10^?$$
$$\approx 10^9*10^9 = 2*10^?$$
So, $$\approx ? = 9$$
 

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