Question

how many 3 digit nos such that when divided by 7 leaving remainder 3​

Answer 1

Answer:

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Answer 2

Explanation : 3 digit numbers are between 100 and 999. First 3 digit number to leave a remainder of 2 when divided by 7 is 100.

Last 3 digit number to leave a remainder of 2 when divided by 7 is 996. it is an AP with

a=100,d=7,tn=996

tn=996=100+7(n−1)

896=7(n−1)

128=n−1

n=129.