Question

How many three digit no. Divisible by 7 . Solve without using the term formula like (Tn = a+(n-1)d

Answer 1

Answer

105, 112,...............,994

an=994

a=105

d=7

994=105+(n-1)7

889-7=7n

n= 882/7

n=126

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Answer 2

Answer:

105, 112, 119,. . . . . . . . . .,994

a = 105

d = 112-105 = 7

an = 994

an = a + (n-1)*d

994 = 105 + (n-1)*7

994 - 105 = (n-1)*7

889 = (n-1)*7

889/7 = n-1

127 = n-1

128 = n

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