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Solution


Q.

A school has decided to plant some endangered trees on 51st World Environment Day in the nearest park. They have decided to plant those trees in few concentric circular rows such that each succeeding row has 20 more trees than the previous one. The first circular row has 50 trees.

Based on the above given information, answer the question :

Q.  How many trees will be planted in the 10th row


Ans.

(230)

Here a= 50 and d= 20

Number of trees planted in 10th row = a10 = 50 + 9 × 20 = 230