Math, asked by mohammedfayiz, 1 year ago

what is the common difference of an AP a21-a7 = 84

Answers

Answered by Róunak
28
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.
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