1.The number of positive integers x with x ≤60 such that each of the rational expressions
7x+1 7x+2 7x+3 7x+300
_____ ______ ______ …, ________
2 3 4 301
is in lowest terms (i.e in each expression, the numerator and denominator have no common factors ) is
A 1 B2 C3 D4 E5
2.In how many ways can a.b.c and d be chosen from the set (0,1,2,...9) so that a <b<c<d and a+b+c+d is multiple of three?
A 54 B64 C63 D90 E72
7x+1 7x+2 7x+3 7x+300
_____ ______ ______ …, ________
2 3 4 301
is in lowest terms (i.e in each expression, the numerator and denominator have no common factors ) is
A 1 B2 C3 D4 E5
2.In how many ways can a.b.c and d be chosen from the set (0,1,2,...9) so that a <b<c<d and a+b+c+d is multiple of three?
A 54 B64 C63 D90 E72