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Without adding, find the sum 1+3+5+7+9+11+13+15+17+19+21? |
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Answer» Answer: 121 Step-by-step explanation: this is a very easy ques it MIGHT have tricked you SINCE it is in A.P . If you are in class 10 you would know this as it is a part of class 10 maths but if not try these ques ...it will INCREASE your interest towards maths ... solution- formula of SN =n/2 { 2A + (n-1 )d} S11 =11/2 ( 2* 1 + 10* 2) S11= 11/2 (2+20) S11 =11/2 *22 S11=11*11= 121 n= no. of terms A = first term Sn = sum of terms hope this helps .... |
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