import std.bigint,std.stdio,std.string;enum M=10^^9+7,S=M/87;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|`    !#$"%=N]ZRU$UCC"KYPA:/FOL :AGK7 (&,#DY:R02RT 1E:G2MY*D)\2#^1&3FS/OHRC:I<M#5[Q)J,DW]0&@!&@VNT;/+_ID-:;LC-^G3ZYH#:P5UA7E7H'YV>ZGA2!^"0F[@8W_K<+2$LF?X8K'QD2,Y-069(=0@^#_6AP<UF@A=6A!/KGZE95UIN2'Y01KMTXOF.V<?4=W['Y7T/D/",.&?5I`[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));}}