import std.bigint,std.stdio,std.string;enum M=10^^9+7,S=M/99;long y,z,e,j;void i(){for(y=1,e=M-2;e;e/=2,z=z*z%M)y=e%2?y*z%M:y;}void f(long n){if(n>M-n)f(M-1-n),i,z=n%2?y:M-y;else{if(n%S<S/2)for(y=1;n%S;)y=y*n--%M;else{for(z=1;n%S;)z=z*++n%M;i;}for(z=j=0;j<5;)z=z<<6|`    !?T?@WBJ8-='L[@RH9#,T-#KX*Z)>E>KS60FCF: .@::< 1C.YGM26E#Y,%1BK$:>[4Z%3556!#FJJLWVQE9:4N\V+).I-8TDE&*OF/E'ZR1*+!*\=)R9D"GJZ^I*FT#= X+AJ(S31%@;$P8GRGO<<QG;M')Y:X9'2W[^1P'$W2<F-G>E3C1 B>NVHP]NCD2RB=UQ!5ORB<@2(K/0;W7$I!R,>)#S!$_J36_#[(D!UV9,"GZ"7"QKX1M:Z<`[n/S*5+j++]-32;z=z*y%M;}}void main(){for(auto t=readln.chomp.BigInt;t--;){auto s=readln.split;BigInt r=s[0],l=s[1];r-=l-1;l=r-l;writeln(l<0||l/M<r/M?0:(f(r%M),r=z,f(l%M),i,r*y%M));}}