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1. a.(3^-1+4^-1)×7^-1
ans~ 3^-1=1/3
4^-1=1/4
7^-1=1/7
- ( 1/3+1/4 )×1/7
LCM OF 3,4 =12
- (4/12+3/12)×1/7
- 7/12×1/7
both 7 will get cancel
- 1/12
couldn't get the last one !!