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A woman borrowed ₹ 10,00,000 from her friend and promised to return the borrowed money in monthly instalments beginning from the next month. After one month, she returned ₹ 10,000, the next month she returned ₹ 15,000, the third month she returned ₹ 20,000 and so on, thereby increasing the monthly instalment uniformly.
In a society, a yoga instructor was hired to train the people of the society to live a healthy lifestyle. Yoga sessions were held daily from 5 p.m. to 7 p.m. in the society park. On day one, 5 people joined the yoga session, on day two, 3 more people joined, on day three, another 3 people joined and in this manner every next day, 3 more people kept on joining.
In an A.P., aₙ - aₙ₋₄ = 32. Its common difference is :
The 20th term of the A.P. : 10√2, 6√2, 2√2,.... is :
Find the sum of the A.P. 7, 10½, 14, ..... 84.
If the sum of first n terms of an A.P. is given by Sₙ = n/2(2n + 8). Then, find its first term and common difference. Hence, find its 15th term.
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