solve this question in copy step step
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a21 = a + 20 d
a7 = a +6d
According to the question = a21 - a7 = 84
=> a + 20d - ( a + 6d ) = 84
=> a + 20d - a - 6d = 84
=> 14d = 84
a21 = a + 20 d
a7 = a +6d
According to the question = a21 - a7 = 84
=> a + 20d - ( a + 6d ) = 84
=> a + 20d - a - 6d = 84
=> 14d = 84
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