· rockets · Rovers (US exploration of Mars)
Words that start with R and end with R:racerradarradiatorrafterrancherrancorratherrazorreaderreaperreappearrearreceiverrecorderrecoverregisterregularregulatorreindeerrelieverremainderrememberreminderremoverrenterreoccurrepairreporterresistorresponderretailerretainerretrieverrevolverriderrigorringerriserriverroarrobberrockerrollerrooferroosterrosterrubberrulerrumorrunner
hammer
Objects that start with the letter "O" include orange, olive, ocean, octopus and owl. Other objects include oatmeal, oboe and octagon.
Perhaps a xylophone
· Rovers (US exploration of Mars)
· rockets · Rovers (US exploration of Mars)
· rabbit · rake · receipt · rifle · ring · rock · rope · rose
If there are n objects and you have to choose r objects then the number of permutations is (n!)/((n-r)!). For circular permutations if you have n objects then the number of circular permutations is (n-1)!
R a d a r
R a d a r
rover
Some abstract nouns that start with the letter "R" include respect, reality, resilience, and regret. These nouns represent concepts or qualities rather than tangible objects. They are often used to describe feelings, states, or ideas in various contexts.
none
The number of R-combinations in a set of N objects is C= N!/R!(N-R)! or the factorial of N divided by the factorial of R and the Factorial of N minus R. For example, the number of 3 combinations from a set of 4 objects is 4!/3!(4-3)! = 24/6x1= 4.
Words that start with R and end with R:racerradarradiatorrafterrancherrancorratherrazorreaderreaperreappearrearreceiverrecorderrecoverregisterregularregulatorreindeerrelieverremainderrememberreminderremoverrenterreoccurrepairreporterresistorresponderretailerretainerretrieverrevolverriderrigorringerriserriverroarrobberrockerrollerrooferroosterrosterrubberrulerrumorrunner
If you have n objects and you are choosing r of them, then there are nCr combinations. This is equal to n!/( r! * (n-r)! ).