Question

1+2+3+4+5+6+7+8+9+10+11+12+13+14+15​

Answer 1

Answer:

120

Step-by-step explanation:

Answer 2

We know that, sum of first 'n' natural numbers is given by the relation:

Sum = n(n+1)/2

Where n is the number of terms.

Now,

The given series(in your question) is the sum of first 15 natural numbers.

Therefore, n = 15.

=> Its sum = n(n+1)/2

= 15(15+1)/2

= 15(16)/2

= 15×8

= 120

Hence, the answer is 120.