Ramkali saved rupees 5 in first …
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Sia ? 5 years, 8 months ago
Here, a = Rs 5
d = Rs 1.75
an = Rs 20.75
We know that
an = a + (n - 1)d
⇒ 20.75 = 5 + (n - 1)d
⇒ (n - 1) (1.75) = 20.75 - 5
⇒ (n - 1) (1.75) = 15.75
⇒n−1=15.751.75
⇒ n - 1 = 9
⇒ n = 10
Hence, the required value of n is 10.
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