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QUESTION
Q
The average of first five multiples of 7 will be ?

Solution

The sum of first five multiples of 7 = 7 × (1 + 2 + 3 + 4 + 5) = 7 × 15 ⇒ Average of first five...

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Study the tables carefully and answer the following questions

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What should come in place of question mark (?) in the following number series: 0, 6, 24, 60, 120, 210

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