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\(\sum_{i=1}^4\) 2n+3 = _____________________(a) 5(b) 12(c) 21(d) 32This question was posed to me by my college professor while I was bunking the class.Query is from Series in portion Sequences and Series of Mathematics – Class 11

Answer»

Correct answer is (d) 32

The best EXPLANATION: a1 = 2*1+3 = 5, a2 = 2*2+3 = 7, A3 = 2*3+3 = 9, a4 = 2*4+3 = 11.

Sum = 5+7+9+11 = 32.



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