(B) The given series follows the pattern of $(n^{2} - 1)$ for even numbers starting from $n = 2$.$2^{2} - 1 = 4 - 1 = 3$$4^{2} - 1 = 16 - 1 = 15$$6^{2

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(B) The given series follows the pattern of $(n^{2} - 1)$ for even numbers starting from $n = 2$.$2^{2} - 1 = 4 - 1 = 3$$4^{2} - 1 = 16 - 1 = 15$$6^{2} - 1 = 36 - 1 = 35$$8^{2} - 1 = 64 - 1 = 63$$10^{2} - 1 = 100 - 1 = 99$$12^{2} - 1 = 144 - 1 = 143$Therefore,the missing term is $6^{2} - 1 = 35$.