Question

Three resistors each of value 3 ohm's are connected in parallel combination.their equivalent resistance is?

Answer 1

Connected in parallel as we know that the formula is 
Rp(when parallel)= 1/R1+1/R2+1/R3
R=3ohm
So according to formula=1/Rp=1/3+1/3+1/3 (Taking lcm of 3,3,3 which is three)
1/Rp=1+1+1/3
1/Rp=3/3
1/Rp=1
Rp=1
so equivalent resistance = 1ohm

Answer 2

Three resistors are connected in parallel
So, 1/R=1/R1 +1/R2 +1/R3


1/R =1/3 +1/3+1/3
1/R= 1+1+1/3 lcm
1/R= 3/3
1/R=1
Reciprocal
R = 1

therefore, equivalent resistance is 1 ohm

I hope it helps u
tq