What is the common difference of an A.P. in which a21 – a7 = 84?
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What is the common difference of an A.P. in which a21 – a7 = 84
Answered by
1
Step-by-step explanation:
a21-a7=84
a21=a+20d
a7=a+6d
a+20d-(a+6d)=84
a+20d-a-6d=84
14d=84
d=84/14
d=6
common difference is 6
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