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Question

If 32744=2p+2, find the value of p?
  1. 6

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Solution

The correct option is A 6
By estimation method, grouping three numbers from the right,
2 744––
Units digit of the first group is 4. So the units digit of the cube root will be 4
The second group has 2 and the only cube number less than 2 is 1.
So the tens digit of the cube root will be 1.

32744=14

Given, 32744=2p+2
2p+2=142p=142=12

p=122=6

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