Question

Chapter : Arithmetic and geometric progression
How many 3 digit numbers are divisible by 7?

Answer 1

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Step-by-step explanation:

128.

The first 3 digit number which is divisible by 7 is 105.

The last 3 digit number divisible by 7 is 994

Using the formula T(nth term) = a + (n-1)d, we have

994 = 105+(n-1)7

7(n-1) = 889

n-1 = 127

n = 128.

Answer 2

Answer:

128

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