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In the following question, a series is given with one term missing. Choose the correct alternative from the given ones that will complete the series.

1 2 3
11 7 5
120 45 ?

  • 19

  • 16

  • 15

  • 17


B.

16

First Column
(11)2 -(1)2 ⇒ 121 - 1 = 120

Second Column
(7)2 - (2)2 ⇒ 49 - 4 = 45

Third Column
(5)2 - (3)2 ⇒ 25 - 19 = 16


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