n ' conducting wires of same dimensions but having resistivities 1,2,3, …n are connected in seri...

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n ' conducting wires of same dimensions but having resistivities 1,2,3, …n are connected in series. The equivalent resistivity of the combination is
a. n(n+1)/2
b. n+1/2
c. n+1/2 n
d. 2 n/n+1

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jada kuchh samjh nhi Aya but clue mil gya

kanakpriya