Скачать или смотреть Que 20 Ex 5.2💡Class 10 Chapter 5💡Maths📲Arithmetic Progressions

Que 20 Ex 5.2💡Class 10 Chapter 5💡Maths📲Arithmetic Progressions
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Arithmetic Progressions Class 10 Chapter 5 in one shot (full chapter)
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Written Solution:-

Que 20. Ramkali saved Rs 5 in the first week of a year and then increased her weekly saving by Rs 1.75. If in the nth week, her weekly savings become Rs 20.75, find n.

Solution:

Given that, Ramkali saved Rs.5 in first week and then started saving each week by Rs.1.75.

Hence,

First term, a = 5
and common difference, d = 1.75
Also given,
an = 20.75
Find, n = ?
As we know, by the nth term formula,
an = a+(n−1)d

Therefore,

20.75 = 5+(n -1)×1.75
15.75 = (n -1)×1.75
(n -1) = 15.75/1.75 = 1575/175
= 63/7 = 9
n -1 = 9
n = 10

Hence, n is 10.

Question 1 Exercise 5.2 AP Class 10
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