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what is the common deference of an ap in which a21-a7=84 |
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Answer» Given.... a 21 - a7 = 84⇒ {a + (21 - 1 ) d} - {a + (7 - 1) d} = 84⇒ a + 20d - a - 6d = 84⇒14 d = 84⇒d = 84/ 14⇒ d = 6Required Common Difference is 6. D =6 |
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