what is common difference of an AP in which a21-a7=84??
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Answered by
15
a21 - a7 = 84
a + 20d - a - 6d = 84
14d = 84
d = 6
Common Difference = 6
a + 20d - a - 6d = 84
14d = 84
d = 6
Common Difference = 6
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Answered by
7
given a21-a7=84
but we can write a21 as a+20d
and a7 as a+6d
substituting in equation
a+20d-a-6d=84
14d=84
d=6
I hope this will help u
but we can write a21 as a+20d
and a7 as a+6d
substituting in equation
a+20d-a-6d=84
14d=84
d=6
I hope this will help u
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