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Answer :

Pens purchased by Raju in Rs 150 = 10 pens
Cost of 1 pen = \(\frac{150}{10} = Rs 15 \)

Pens purchased by Manish in Rs 84 = 7 pens

Cost of 1 pen = \(\frac{84}{7} \)

\(\therefore \) Pens purchased by Manish are cheaper than Raju

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