Advertisements
Advertisements
Question
The value of (13 + 23 + 33 + ... + 153) – (1 + 2 + 3 + ... + 15) is
Options
14400
14200
14280
14520
Advertisements
Solution
14280
Explanation;
Hint:
`((15 xx 16)/2)^2 - (15 xx16)/2`
= (120)2 – 120
= 14280
APPEARS IN
RELATED QUESTIONS
Find the sum of the following series
1 + 2 + 3 + ... + 60
Find the sum of the following series
3 + 6 + 9 + ... + 96
Find the sum of the following series
1 + 4 + 9 + 16 + ... + 225
Find the sum of the following series
1 + 3 + 5 + ... + 71
If 1 + 2 + 3 + ... + k = 325, then find 13 + 23 + 33 + ... + k3
If 13 + 23 + 33 + ... + k3 = 44100 then find 1 + 2 + 3 + ... + k
Rekha has 15 square colour papers of sizes 10 cm,11 cm,12 cm, …, 24 cm. How much area can be decorated with these colour papers?
Find the sum of the series (23 – 13) + (43 – 33) + (63 – 153) + ... to n terms
Find the sum of the series (23 – 13) + (43 – 33) + (63 – 153) + ... to 8 terms
The value of a motorcycle depreciates at a rate of 15% per year. What will be the value of the motorcycle for 3 year hence, which is now purchased for ₹ 45,000?
