Discuss Forum

1. What is the sum of the squares of the digits from 1 to 9

  • A. 260
  • B. 260
  • C. 260
  • D. 260

Answer: Option C

Explanation:

12 + 22 + 32 + ........ + 92

n সংখ্যক স্বাভাবিক সংখ্যার বর্গের সমষ্টি = n(n + 1)(2n + 1) /6 = 9(9 + 1) ( 2×9 + 1)/6 = 9×10×19/6 = 285


Post your comments here:

Name:
Mobile:
Email:(Optional)

» Your comments will be displayed only after manual approval.