RMUTATIONS AND COMBINATIONS(0) How many numbers are there between 100 – InterviewSolution

1.

RMUTATIONS AND COMBINATIONS(0) How many numbers are there between 100 and1000 such that 7 is in the unit's place?

Answer»

first number is 107 and last number is 997And d=10so 997=107+(n-1)×10890=(n-1)10so n-1=89so n=90so 90 numbers have 7 in unit place

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