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The logic followed here is as follows, From the left end, (First number + Second number) ÷ 2 = Third number. (285, 313, 299) → (285 + 313) ÷ 2 = 598 ÷ 2 = 299. (315, 267, 294) → (315 + 267) ÷ 2 = 582 ÷ 2 = 291 ≠ 294. (142, 244, 205) → (142 + 244) ÷2 = 366 ÷ 2 = 183 ≠ 205. (443, 251, 347) → (443 + 251) ÷ 2 = 694 ÷ 2 = 347 (534,222, 381) → (534 + 222) ÷2 = 756 ÷ 2 = 378 ≠ 381.
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