how many terms of the sequence -8,-6,-4,........ must be taken , so that their sum is 70
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Answer:
up to 50..............
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Answer:
Given term in ap -8, -6, -4 ...... 70
a = -8
d = 2
Tn = 70
We know that
Tn = a + ( n -1 ) d
70 = -8 + ( n -1 ) × 2
70 = -8 + 2n -2
70 = -10 + 2n
70 +10 = 2n
80 = 2n
n = 40
Therefore 40 th term = 70
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