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What is the common difference of an ap in which a21-a7 84 |
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Answer» A+20d Monika its 20 there not 10 Correct answer is 21 and i solve it downwards with my name monika sain8 a21-a7=84a21 = a+10d _ (1)a7 =a+6d _ (2)(1) - (2) = 84a + 10d - a - 6d = 84By above equation we obtained4d = 84Then d = 2121 is correct answer A21-A7=84A+20d-(A+6d)=8414d=84d=6 What is the. Question I cannot understand so plz told clearly 6 |
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