My first problem!
Algebra
Level
4
\[1 \cdot 4 + 4 \cdot 7 + 7 \cdot10 + 10 \cdot13 + \cdots + 97\cdot100 \]
Find the sum of digits of the value of the sum above.
For example, if the sum is 12, then submit your answer as \(1+2=3\).
by
Mark Recio