Question
जर $t_9 = 23$  व $a = 7$, तर $d$ ची किंमत काढा.

Answer

$t_9 = 23 ..............[$दिले आहे.$]$
$\therefore 7 + (9 – 1)d = 23 ............[t_n = a + (n - 1)d]$
$\therefore 7 + 8d = 23$
$\therefore 8d = 16$
$\therefore d=\frac{16}{8}$
$=2$

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