Question

Find how many two digit natural numbers are divisible by 7

Answer 1

Answer:

TWO DIGITS NUMBER DIVISIBLE BY 7 ARE AS FOLLOWS

14,21,28,35,42,49,56,63,70,77,84,91,98

Answer 2

13 numbers.

✔️Solution -

14, 21, 28, 35,...98 are in A.P

First term, a = 14

Common difference, d = 21-14 = 7

Last term, tn = 98

tn = a + (n-1)d

98 = 14 + (n-1)7

98 = 14 + 7n - 7

7n = 98-7

7n = 91

n = 13