suppose if cells are joined in parallel and they don't have same internal resistance then can we use the cell formula for calculating emf of cells combined in series and parallel??

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$N o, f o r m u l a f o r e m f o f c e l l s c o m b i n e d i n s e r i e s a n d p a r a l l e l c a n n o t b e u s e d f o r e m f o f c e l l s o f d i f f e r e n t i n t e r n a l r e s i s \tan c e c o n n e c t e d i n s e r i e s .$

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suppose if cells are joined in parallel and they don't have same internal resistance then can we use the cell formula for calculating emf of cells combined in series and parallel??

No, formula for emfof cells combined in series and parallel can not be used for emf of cells of different internal resistance connected in series.

$N o, f o r m u l a f o r e m f o f c e l l s c o m b i n e d i n s e r i e s a n d p a r a l l e l c a n n o t b e u s e d f o r e m f o f c e l l s o f d i f f e r e n t i n t e r n a l r e s i s \tan c e c o n n e c t e d i n s e r i e s .$