Q61. Complete the given series: 25 : 37 : : 49 : ?

(a) 56

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(b) 60

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(d) 70

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Solution

The correct option is C
(c) 65

$(x)^{2} = (x + 1)^{2} + 1 (5)^{2} = (5 + 1)^{2} + 1 25 = 36 + 1 = 25 : 37 49 = (7)^{2} = (7 + 1)^{2} + 1 = 49 = 64 + 1 49 = 65$

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