what is the common difference of an AP a21-a7 = 84
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Given....
a 21 - a7 = 84
=> {a + (21 - 1 ) d} - {a + (7 - 1) d} = 84
=> a + 20d - a - 6d = 84
=> 14 d = 84
=> d = 84/ 14
=> d = 6
Re.qd Common Difference is 6.
a 21 - a7 = 84
=> {a + (21 - 1 ) d} - {a + (7 - 1) d} = 84
=> a + 20d - a - 6d = 84
=> 14 d = 84
=> d = 84/ 14
=> d = 6
Re.qd Common Difference is 6.
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