a ladder has rungs 25 CM apart. the rungs decrease uniformly in length from 45 cm at bottom and 25 cm at top. if the top and bottom rungs are 1 1 by 2 metre apart what is the length of the wood required for the rungs
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11/2 =11/2*100= 550 CM
NUMBER OF RUNGS = 550/25+1 =23
SUM OF 23 NUMBERS IN AP
= N/2 (A+L)
23/2+(45+25)
23* 35=805
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