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Consider a 7 digit telephone no. 336-7624 which has the property that the first three digit prefix,336 equals the product of the last four digits. How many seven digit telephone numbers beginning with 336 have this property?

Consider a 7 digit telephone no. 336-7624 which has the property that the first three digit prefix,336 equals the product of the last four digits. How many seven digit telephone numbers beginning with 336 have this property?

Grade:11

1 Answers

Gangadher
29 Points
8 years ago

Given that

no- 336-7624,having the property "the first 3 digit prefix,336 equals the product of the last 4 digits"

so noe i can fis first 3 digits at first 3places

 

     3  3  6  -  -  -  -

next 4 palces i can put 7,6,2,4.

so....    4!

 
 
 
 

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