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251, 130, 274, ?, 301, 76 251 - (11)2 = 130 130 + (12)2 = 274 274 - (13)2 = 105 105 + (14)2 = 301 301 - (15)2 = 76
1600, 330, 48, 23.2, ?, 31.0464
620 632 608 644 596 ?
...7, 14, 42, 210, 1470, ?
6 3.5 2.5 ? 8.5 23.75
...640 320 160 ? 40 20
(32.03 + 111.98) ÷ 18.211 = 89.9 – 20.23% of ?
7 12 33 ? 635 3804
...6 10 ? 210 1672 16710
...37 59 103 191 ? 719
If the first term of the arithmetic progression is 18, the common difference is 5, and the number of terms in the series are 40, then find the sum of th...
