what is the common difference of an ap in which A21 - A7 is equal to 84?
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Hi there !
a₂₁ - a7 = 84
a₂₁ = a + 20d
a₇ = a + 6d
Hence,
a + 20d - (a + 6d) = 84
a + 20d - a - 6d = 84
14 d = 84
d = 84/14
d = 6
Common difference of the A.P is 6
a₂₁ - a7 = 84
a₂₁ = a + 20d
a₇ = a + 6d
Hence,
a + 20d - (a + 6d) = 84
a + 20d - a - 6d = 84
14 d = 84
d = 84/14
d = 6
Common difference of the A.P is 6
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