Question

_ + (_ * _) / _ = 49 given 3,4,5,1

Answer 1

Answer:

We know that there are five odd numbers from 1 to 10 that are 1,3,5,7,9

Therefore, there are 5×5=25 odd numbers from 1 to 50.

We also know that 51 is also an odd number.

Thus, there are 25+1=26 odd numbers from 1 to 51.

In general, the sum of the first n odd natural numbers is equal to n

2

, for every natural number n.

Therefore, the sum 1+3+5+.....+51 can be found by squaring the number of odd numbers that is 26

2

=676

Hence, 1+3+5+.....+51=676