import std.bigint,std.stdio,std.string;enum M=10^^9+7,S=M/83;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|`    !2_7]?:T*Q"(CY8B Q9#6-%6-:7;F9U )IV.:69+*B^0FV<VTY/OUG!R UNVB$-&3BW;$=AUX6QB,ARE*RE?HZQ0'0HE>[/6$,APL2D^8&M6(18Z4203;N>$UB"3G, _TALK>=1%)OW87>@=!'(:K('-E]9PK^7"+ULCT; N+13?4O<T /NW8"&V/VWC0]\9N&S)A>+EA L5WL<O0%H`[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));}}