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20. In a potato race, a bucket is placed at the starting point, which is 5 m fand the other potatoes are placed 3 m apart in a straight line. There aline (see Fig. 5.6)firpotatoS3 m: |
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Answer» A1=2x5=10 A2=2x(5+3)=16 A3=2x(5+3+3)=22 S10=10/2(2x10+(10-1)6) =5(20+9x6) =5x(20+54) =5x74 S10=370 |
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