1.

What is the sum of the first 25 odd natural numbers?1). 4752). 5753). 6004). 625

Answer»

The numbers are 1, 3, 5, 7…., 49

Sum of N terms of an AP = n/2 × {2a + (n - 1)d}

Where a is the first term, n is the number of terms and d is the common DIFFERENCE

First term of the series (a) is 1

Common difference (d) = 3 - 1 = 2 and n is 25

Sum = 25/2 × (2 + 24 × 2) = 625



Discussion

No Comment Found