Question

I How many three digit number
one divisible by 7.​

Answer 1

Answer:

128

Step-by-step explanation:

105, 112, 119, 126 ... 994

Since difference is same, it is an AP...

We need to find number of terms, i.e., n

an = a + (n-1) d

Here:

an = 994, a = 105, d= 7

>>994 = 105 + (n - 1) x 7

>>994 = 105 + n (7)-1 x (7)

>>994 = 105 + 7n - 7

>>994 – 105 + 7 = 7n

>>896 = 7n

>>896/7 = n

>>128 = n

.°. n = 128

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Answer 2

a = 105

l = 994

d = 7

a + (n-1) d = l

105 + 7n - 7 = 994

7n = 994 - 98

7n = 896

n = 896/7

n = 128

There are 128 numbers.