The third proportional of (a + b) and (a + b)2 is

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RRB Group D 1 Sept 2022 Shift 2 Official Paper
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  1. (a + b)3
  2. a
  3. b
  4. (a + b)

Answer (Detailed Solution Below)

Option 1 : (a + b)3
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Detailed Solution

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Given: 

1st Proportional(a) = (a + b)

2nd Proportional(b) = (a + b)2

Formula Used:

If there are two numbers a and b

Then third proportional of a and b = b2/a 

Calculation:

Third proportional:

= [(a + b)2]2/(a + b)

= (a + b)3

∴ The third proportion is (a + b)3

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