Question

Add the numbers in the series 3+11+19+27+.....+395+403.

Answer 1

Answer:

10353

Step-by-step explanation:

The given series is in arithmetic progression since the common difference is same which is 8.

To find the sum of series we can simply apply the formula'

S= n/2( first term + last term)

S is the sum and n is the number of terms

we also need to find the number of terms n

n = (last term- first term)/2 + 1

$n= \frac{403-3}{8} + 1$

n= 51

$s= \frac{51}{2}(3+403)$

s= 10353