0

Guest

Courses New

1. In which of the following situations, does the list of numbers involved make as arithmetic progression and why? (i) The taxi fare after each km when the fare is Rs 15 for the first km and Rs 8 for each additional km.

1. In which of the following situations, does the list of numbers involved make as arithmetic progression and why?

(i) The taxi fare after each km when the fare is Rs 15 for the first km and Rs 8 for each additional km.

Grade:12th pass

1 Answers

Pawan Prajapati
askIITians Faculty 60796 Points
one year ago
We can write the given condition as; Taxi fare for 1 km = 15 Taxi fare for first 2 kms = 15+8 = 23 Taxi fare for first 3 kms = 23+8 = 31 Taxi fare for first 4 kms = 31+8 = 39 And so on…… Thus, 15, 23, 31, 39 … forms an A.P. because every next term is 8 more than the preceding term. (ii) The amount of air present in a cylinder when a vacuum pump removes 1/4 of the air remaining in the cylinder at a time. Solution: Let the volume of air in a cylinder, initially, be V litres. In each stroke, the vacuum pump removes 1/4th of air remaining in the cylinder at a time. Or we can say, after every stroke, 1-1/4 = 3/4th part of air will remain. Therefore, volumes will be V, 3V/4 , (3V/4)2 , (3V/4)3…and so on Clearly, we can see here, the adjacent terms of this series do not have the common difference between them. Therefore, this series is not an A.P. (iii) The cost of digging a well after every metre of digging, when it costs Rs 150 for the first metre and rises by Rs 50 for each subsequent metre. Solution: We can write the given condition as; Cost of digging a well for first metre = Rs.150 Cost of digging a well for first 2 metres = Rs.150+50 = Rs.200 Cost of digging a well for first 3 metres = Rs.200+50 = Rs.250 Cost of digging a well for first 4 metres =Rs.250+50 = Rs.300 And so on.. Clearly, 150, 200, 250, 300 … forms an A.P. with a common difference of 50 between each term. (iv) The amount of money in the account every year, when Rs 10000 is deposited at compound interest at 8% per annum. Solution: We know that if Rs. P is deposited at r% compound interest per annum for n years, the amount of money will be: P(1+r/100)n Therefore, after each year, the amount of money will be; 10000(1+8/100), 10000(1+8/100)2, 10000(1+8/100)3…… Clearly, the terms of this series do not have the common difference between them. Therefore, this is not an A.P.

Think You Can Provide A Better Answer ?

Provide a better Answer & Earn Cool Goodies See our forum point policy

Other Related Questions on 10 grade maths

View all Questions »

ASK QUESTION

Get your questions answered by the expert for free

Answer and earn gift vouchers

Win Gift vouchers upto Rs 500/-

View courses by askIITians

Design classes One-on-One in your own way with Top IITians/Medical Professionals

Click Here Know More

Complete Self Study Package designed by Industry Leading Experts

Click Here Know More

Live 1-1 coding classes to unleash the Creator in your Child

Click Here Know More

a Complete All-in-One Study package Fully Loaded inside a Tablet!

Click Here Know More