  A combination of three LHCb measurements of the CKM angle gamma is presented.
The decays B->DK and B->Dpi are used, where D denotes an admixture of D0 and
D0-bar mesons, decaying into K+K-, pi+pi-, K+-pi-+, K+-pi-+pi+-pi-+, KSpi+pi-,
or KSK+K- final states. All measurements use a dataset corresponding to 1.0
fb-1 of integrated luminosity. Combining results from B->DK decays alone a
best-fit value of gamma = 72.0 deg is found, and confidence intervals are set
gamma in [56.4,86.7] deg at 68% CL, gamma in [42.6,99.6] deg at 95% CL. The
best-fit value of gamma found from a combination of results from B->Dpi decays
alone, is gamma = 18.9 deg, and the confidence intervals gamma in [7.4,99.2]
deg or [167.9,176.4] deg at 68% CL, are set, without constraint at 95% CL. The
combination of results from B->DK and B->Dpi decays gives a best-fit value of
gamma = 72.6 deg and the confidence intervals gamma in [55.4,82.3] deg at 68%
CL, gamma in [40.2,92.7] deg at 95% CL are set. All values are expressed modulo
180 deg, and are obtained taking into account the effect of D0-D0bar mixing.
