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How many three digit number divisible by 7?

Posted by Yash Mishra 5 years, 2 months ago

CBSE > Class 10 > Mathematics

2 answers

Yogita Ingle 5 years, 2 months ago

here a= 105
l= 994
n=?
d= 7
so
994 = 105+(n-1) 7
= 105+7n-7
994= 98+7n
994-98 = 7n
896/7 = n
n= 128
so 128 three digit numbers are divisible by 7

1Thank You

😶😶😶 😶😶😶 5 years, 2 months ago

Given, A(first term)=105,An(last term)=994,d( common difference)=7,n=? An=A+(n-1)d 995=105+(n-1)7 887=(n-1)7 n-1=127 n=127+1=128 Hence, there are total 128 three digit no. divisible by 7.

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