Question

how many 3 digit number are divisible by 7​

Answer 1

Answer:

ANSWER IS 128.

Step-by-step explanation:

numbers begin from 105 ...... 994

here a=105

l=994

n=?

d=7

so,

an=a+(n-1)d. here an refers to l

994=105+(n-1)7

994-105=(n-1)7

889=(n-1)7

889=(n-1)

7

127=n-1

n=127+1

n=128

.'. there are 128 three digit numbers divisible by 7

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Answer 2

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$\mathbb{\huge{\green{ANSWER}}}$

➡$\huge\boxed{{128}}$

Step-by-step explanation:

HERE a = 105

l = 994

n = ?

d = 7

SO,

994. = 105 +(n-1) 7

= 105 + 7n - 7

994 = 98 + 7n

994 - 98= 7n

896/7 = n

n = 128

therefor 128 is divisible by 7

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