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2² = 4 3² + 1 = 10 4² = 16 5² + 1 = 26 6² = 36 7² + 1 = 50 Then, (x² - 1) + ( x² + 1) ⇒ (36² - 1) + (36² + 1) ⇒ (1296 – 1) + (1296 + 1) ⇒ 1295 + 1297 = 2592
1930 1805 1589 1246 734 ?
...-3 -10 -40 -185 -905 -4500
-4 a b c d e
Find the value of d.
...35 18 19 30 62 ?
5 ? 205 823 7405 29623
30 15 15 30 120 ?
...4 6 12 ? 44 74
...24, 33, 50, ?, 108, 149
7, 26, 238, 962, 8522, 34078
13, 26, 104, ?, 13312, 425984
7, 14, 42, 210, 1470, ?