A class has 40 students For flood relief fund each student contributed as many Rupees as the square of - Maths - Squares and Square Roots

Question

A class has 40 students For flood relief fund each student
contributed as many Rupees as the square of his roll number What is
the total collection?

Varun Rawat · Accepted Answer

Total collection = 12 + 22 + 32 +
+ 402Now, we know that,12 + 22 + 32 + 
+ n2 = nn+12n+16So, 12 + 22 + 32 +
+ 402 = 4040+140×2+16=40×41×816=22140Total collection = Rs 22140

A class has 40 students. For flood relief fund each student contributed as many Rupees as the square of his roll number. What is the total collection?