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nth Term of A.P

If C· d of ...

Question

If $C \cdot d$ of an $A . P$ is 5. Find the value $a_{18} - a_{13}$

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Solution

$d = 5$
$a_{18} - a_{13}$ $= a + 17 d - (a + 12 d), a + 17 d - a - 12 d, = 5 d, = 5 (5), = 25.$

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