Question

1.Find the sum of the first 25 odd natural numbers.
2.Write the perfect square numbers from 1 to 100.​

Answer 1

Answer- 1) 625

2) the perfect square numbers from 1 to 100 are, 1, 4, 9, 16, 25, 36, 49, 64, 81 and 100.

Answer 2

1) The odd numbers are: 1, 3, 5, 7, 9,….49

The first term is = 1

The common difference is, d = 2

The total no.of terms is, n = 25

Sum = n/2 x (a+Tn)

=25/2 x (1+49)

=1250/2

= 625

Therefore, the sum of first 25 odd numbers is 625.

2) 4,9,16,25,36,49,64,81,100