1. How many three digit numbers are divisible by 7?.
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Step-by-step explanation:
the three digit no. which is divisible by 7 are 105,112,119,...............,994
an= 994, a= 105, d = 112-105=7, n =?
an= a+(n-1)d
994= 105+(n-1)7
994= 105+7n-7
994= 98+7n
994-98= 7n
7n = 896
n = 896/7
n = 128 ans.
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