4. If 1 + 2 + 3+....+ k = 8281then find 1+ 2+ 3+....+ k.
Answers
Answered by
0
8281 is the answer of the question
TarakSanju:
how u got 8281?? can u explain it clearly
Answered by
0
Answer:
there is some mistake in data
Step-by-step explanation:
1 + 2 + 3+....+ k = 8281
=> k ( k + 1)/2 = 8281
=> k² + k = 16562
=> k² + k - 16562 = 0
k =( - 1 ± √1² - 4(1)(-16562) )/2
=> k = ( -1 + √66249 )/2 ( -ve value ignored as k can not be - ve)
=> k = (- 1 + 257.39)/2
k is not an integer
so there is some mistake in data
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