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5.3 ques 5 |
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Answer» a=5, l= 45, Sn=400 Sn=n/2(a+l)400=n/2(5+45) =n/2×50=25n n=400/25 =16l=a+(n-1)d45=5+(16-1)d40=15dd=40/15 =8/3n=16 and d=8/3 Use both formula An and Sn A is 5An is 45Sn is 400N is ? And d is ? Hello |
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