InterviewSolution
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InterviewSolution
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Find the sums given below : (i) `7+10 1/2+14+dot dot dot+84`(ii) `34+32+30+dot dot dot+10`(iii) `5+(8)+(-11)+dot dot dot+( 230)` |
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Answer» Correct Answer - (i) `1046(1)/(2)` (ii) 286 (iii)-8930 (iv) 420 `(i) a = 7,d = ((21)/(2) - 7) = (7)/(2) "and" I = 84.` `T_(n) = 84 rArr a + (n-1)d = 84 rArr 7+(n-1) xx (7)/(2) = 84 rArr n = 23.` `S_(23) = (n)/(2)(a+l) = (23)/(2)(7+84) = 1046(1)/(2).` |
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