A firm has 2 senior partners and 5 junior partners. How many different groups of 3 partners can be formed in which at least one member of the group is a senior partner? (Note that two groups are considered different if at least one group member is different.)	Choose the correct choice from the following options:
A) 17  B) 21  C) 25  D) 29  E) 33
The number of ways to form a group of 3 is 7253 = 35   The number of groups with no senior partner is 5253 = 10   The number of groups with at least one senior partner is 35-10= 
<gadget id="calculator">35-10</gadget>
<output>25</output>
25   The answer is 25.
<result>C</result>
A firm has 2 senior partners and 5 junior partners. How many different groups of 3 partners can be formed in which at least one member of the group is a senior partner? (Note that two groups are considered different if at least one group member is different.)