7. How many three digit numbers are divisible by 7?
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26
Answer:
105,112,119....994(no. in A.P)
a=105
d=112-105
=7
n=?
an=994
so,by the formula
an=a+(n-1)d
994=105+(n-1)7
994-105=7n-7
889+7=7n
896=7n
so,n=128(means 128 three digit no. can be divisible by 7)
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