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How many phone numbers can be made if the first digit must be 1, the second digit must be a number in the range 3-5, the third digit must be a number in the range (6-9), and the last seven digits can be any single digit number 0-9

Respuesta :

PHG

Step-by-step explanation:

1st digit is 1 number (1)

2nd digit is (3,4,5) so it's 3 numbers

third digit is (6,7,8,9) is it's 4 numbers

last 7 digits is 10 (0,1,2,3,4,5,6,7,8,9)

multiply

1*3*4*10=120

so answer is 120 phone numbers

khuranashilpa76

By using simple permutation and combination.

Permutation and Combinationn

The number in the first digit = is 1 number (1)

Numbers in the second digit = 3 numbers (5,6,7)

Numbers in the third digit = 4 numbers (6,7,8,9)

Numbers in last 7 digits = 10 numbers  (0,1,2,3,4,5,6,7,8,9)

multiply

1*3*4*10=120

∴ the answer is 120 phone numbers

Learn more about permutation and combination here: https://brainly.com/question/4658834

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