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Class 10MathematicsArithmetic Progressions (AP)Word problems based on APsEasy
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A gardener plants (12) plants in the first row and (4) more plants in each next row. How many plants are in the (7)th row?

Answer and explanation

Correct answer: 36

The numbers of plants form an arithmetic progression (AP), with first term a = 12 and common difference d = 4. The 7th term is a₇ = a + (7 − 1)d = 12 + 6 × 4 = 36. Therefore, 36 is correct. Getting 34 results from an incorrect count of the increases or common difference. Exam tip: always use aₙ = a + (n − 1)d for the nth term.

Related tags

Arithmetic ProgressionAp Word ProblemsNth TermCommon DifferenceClass 10 MathematicsWord Problems Based On ApsArithmetic Progressions (Ap)Arithmetic Progressions Ap
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