Given a set of ,s, from 1 to 50 ,there exists a subset of numbers where the sum of any pair of numbers is not divisible by 7. find the no of elements in the
of the set.

The second term of an arithmetic sequence is 30. the fifth term is 90.calculatei). the commor difference of the sequence ii). the first term of the sequence tje first, second and fifth terms of the arithmetic sequence are the first three terms of a geometric sequence calculate the seventh term of the geometric sequence