M4maths Previous Puzzles

16 Jul 2013 AP

Find the sum of all odd integers between 2 and 100 which are divisible by 3.

OPtion

1) 767
2) 897
3) 867
4) 987
5) 768
6) 679
7) 785
8) 989
9) 877
10) None of these

Solution

Sequence 3,9,15,21,..........99
Clearly a=3; common difference = 6
An=99
a+(n-1)d = 99
3+(n-1)6=99
n=17
solve
867
option 3

Correct Option: 3 Best Solution (0)