Question
Find the wrong number in given number series.
1930, 1813, 1730, 1609, 1522, 1445Solution
Series are in decreasing order- 1930 – 117 = 1813 1813-107 = 1706 1706 -97 = 1609 1609 -87 = 1522 1522 - 77 = 1445
Find the exact value of cos120°
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