Q12 of 167 Page 19

Find the sum of the series: 3 + 5 + 7 + 6 + 9 + 12 + 9 + 13 + 17 + … to 3n terms

given an AP is whose first term is 3 and d is 2

So, the sum is given by formula

To find: sum of the given AP

Substituting the values in the formula

s = 3n(3n + 2)

Find the sum of all even integers between 101 and 999

Find the sum of all integers between 100 and 550, which are divisible by 9

Find the sum of all those integers between 100 and 800 each of which on division by 16 leaves the remainder 7

Solve:

25 + 22 + 19 + 16 + … + x = 115