Instructions

What should come in place of question mark (?) in the following questions ?

Question 170

$$(10)^{24}\times (10)^{-21}=?$$

Solution

By rule of indices,

ab x ac = ab+c

Hence, by this rule, we can solve as,

$$(10)^{24}\times (10)^{-21}= (10)^{24-21} =10^3 = 1000$$

Therefore, correct option is D.

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