code for computing and printing list of combinations

[Joi Mond]

To All,
Can someone help me with the proper code to compute combinations for n=7, r=5 for the following list of numbers: 7, 8, 10, 29, 41, 48, 55. There should be 21 combination.
Also once there list is made can a code be written to add (sum) each of the set of five number in the the list. For example list: 8, 10, 29, 48, 55, = 150.
Thanks
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