Question

Your friend finds it difficult to get the sum of first 30 consecutive odd numbers starting from one. He/ She is taking much time get the answer for it. What is the shortcut way you can teach your friend to get the answer in quicker way?

Answer 1

Answer:

The sum of the first 30 odd numbers is 900

Answer 2

Answer:

The best and easy way to do is to use the formula Sn=n/2(2a+(n-1)×d)

Step-by-step explanation:

n=30

a=1

d=3-1=2

now,

Sn=30/2(2×1+(30-1)2)

=15(2+58)

=15×60

=900