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प्रश्न
Find d if t9 = 23 व a = 7
उत्तर
t9 = 23 ......[Given]
∴ 7 + (9 – 1)d = 23 ......[tn = a + (n – 1)d]
∴ 7 + 8d = 23
∴ 8d = 16
∴ d = `16/8`
= 2
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