Anniversary is on 23rd of the month
She will collect 276 books on 23rd day of the month.
1 + 2 + 3 + ……. 21 + 22 + 23 = 276
It reminds me of a formula we learnt in school
the sum of series 1 + 2 + 3……. n
is n x (n+1)/2
That was a good learning 🙂
Here are more interesting puzzles for you
- Can you find 8 differences
- Can you solve these five riddles?
- Only genius people can answer and reply
- An innocent girl was born before her mother
- What is the car parking number?
Page 2 of 2
Discussion about this post