In an ap a20 - a13 = -28 then common difference find
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Ans: a20 - a13 = -28
=> a + 19d - ( a + 12d) = -28
=> a + 19d - a - 12d = -28
=>7d = -28
=> d = -4
Hope it helps...!!
=> a + 19d - ( a + 12d) = -28
=> a + 19d - a - 12d = -28
=>7d = -28
=> d = -4
Hope it helps...!!
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