· 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
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)! ).
Henry R. Start was born in 1845.