How many three digit number are divisible by 7
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Sol: The first three digit number which is divisible by 7 is 105 and last three digit number which is divisible by 7 is994. This is an A.P. in which a = 105, d = 7 and l = 994. Let the number of terms be n .
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Answer:
128 numbers.
Step-by-step explanation:
999 is the biggest three digit number.
999 ÷ 7 = 142.714... ≈ 142 (rounded down)
There are 142 numbers divisible by 7 from 1 to 999.
99 is the biggest two digit number.
99 ÷ 7 = 14.143 ≈ 14 (rounded down)
There are 14 numbers divisible by 7 from 1 to 99.
142 - 14 = 128.
There are 128 numbers divisible by 7 from 100 to 999.
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