Question

3.
The sum of first 64 natural numbers is:
(a) 2015
(b) 2080
(c) 1974
(d) None of these.
solve it​

Answer 1

Sum of first 64 natural numbers:

$\frac{n(n + 1)}{2}$

$\implies \frac{64(64 + 1)}{2}$

$\implies 32 \times 65$

$\orange{\therefore 2080}$

HOPE THAT HELPS!!