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Whats wrong with the solution?? Plz tell

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@IshittaU I think it should be like this!!

@IshittaU
I think it should be like this...

@Swatimore but what's wrong with my solution ?Ro is the resistance at base temperature which is 0°C. Plz tell??

@Swatimore in books solution given in this format also then which is correct??

Try by this. This is the principle formula. The one you have applied is assumed only when we know that alpha(t2t1)<<1. As its the expansion of e^x where we have neglected higher power as they may come out to be too small. But since we dont know alpha here i think you should solve without expansion and by principle formula...