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A student builds square pattern with sq...

A student builds square pattern with square bricks using the following sequence of steps.
The number of bricks used in the Ist stage is 1,the number of additional bricks used in the 2nd stage is 3, the number of additional bricks used in the 3rd stage is 5 and son on .How many additional bricks does the student use in the 5th stage ?

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A N EXCEL PUBLICATION-SEQUENCES AND SERIES-QUESTION BANK
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