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The cost of one pen is Rs. 7, then what is the rule for the cost of ‘n’ pens ? |
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Answer» Cost of one pen = Rs. 7 = 1 × 7 Cost of two pens = Rs. 7 + Rs. 7 = 2 × 7 Cost of three pens = Rs. 7 + Rs. 7 + Rs. 7 = 3 × 7 …………………………………….. Cost of n pens = Rs. 7 + Rs. 7 + Rs. 7 ….. n times = 7 × n Rule for cost n pens = 7.n. |
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