Question

what is the common difference of an AP in which a21 - a7 = 84

Answer 1

Heya!
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♦Arithmetic Progressions♦
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◾Given that =>
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=> a21 - a7 = 84

=> a + 20d - ( a + 6d ) = 84

=> a + 20d - a - 6d = 84

=> 14d = 84

=> d = 84/14

=> d = 6
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➡Hence the Common Difference ( d ) is 6

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Answer 2

❤❤Here is your answer ✌ ✌

$\huge {\red {\bold {Answer}}}$
Given:-

a21-a7=84

=>(a+20d)-(a+6d)=84
=>a+20d-a-6d=84

=>14d=84
=>d=6



I hope it helps you