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# 10 sergeants and 7 lieutenants meet at the training camp. If

Author Message
Manager
Joined: 04 Nov 2006
Posts: 131

Kudos [?]: 91 [0], given: 8

10 sergeants and 7 lieutenants meet at the training camp. If [#permalink]

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13 Nov 2006, 21:15
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10 sergeants and 7 lieutenants meet at the training camp. If each sergeant salutes each other and the lieutenant once and each lieutenant salutes each sergeant back but not each other, how many salutes took place?

144
131
115
90
45

Kudos [?]: 91 [0], given: 8

Manager
Joined: 29 Aug 2006
Posts: 156

Kudos [?]: 7 [0], given: 0

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13 Nov 2006, 21:26
I get 90....not sure though.

Kudos [?]: 7 [0], given: 0

Senior Manager
Joined: 08 Jun 2006
Posts: 335

Kudos [?]: 63 [0], given: 0

Location: Washington DC

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13 Nov 2006, 22:12
115 ?
10 C 2 + 10 * 7 = 115

Kudos [?]: 63 [0], given: 0

GMAT Club Legend
Joined: 07 Jul 2004
Posts: 5032

Kudos [?]: 452 [0], given: 0

Location: Singapore

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13 Nov 2006, 23:03
# of combinations for sergeants saluting each other = 10C2 = 45

# of ways for sergeant and lieutenant saluting each other = 70

Total = 115

Kudos [?]: 452 [0], given: 0

13 Nov 2006, 23:03
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# 10 sergeants and 7 lieutenants meet at the training camp. If

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