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Find the missing number in the following number series.
227, ?, 270, 304, 353, 422.
11, 32, 74, 158, 326, ?
?, 80, 158, 471, 1880, 9395
59, 60, 56, 65, 49, ?
What will come in place of the question mark (?) in the following questions?
510÷?=√324+√256
?² = 55% of 440 – 80% of 345 + 2 × 7²
209 ÷ 399 × 21² - (11)² = ?
86 × 5 + 26 × 11 – 22 × 13 = ?
(15)² +? ² = 24 × 22 + 23 × 6
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