51^7 -51^6 by 25
__*25
                                             
                                          
                                          
                                        
											 
											Answer:
Step-by-step:
51⁷-51⁶ = 51⁶(51-1) = 51⁶(50)
50 is divisible by 25, so 51⁷-51⁶ is divisible by 25.