find sum 40 if 3rd term is 1 and 6th term is -11
Answers
Answered by
1
Let 2nd term be x.
so,
-11 + x + 1 = 40
=) -11 + 1 + x = 40
=) -10+ x = 40
=) x = 40 + 10
=) x = 50
so,
-11 + x + 1 = 40
=) -11 + 1 + x = 40
=) -10+ x = 40
=) x = 40 + 10
=) x = 50
Answered by
1
a + 2d = 1
a +5d = -11
Solving, -3d = -12
d = -4
So a = 9
Sum = 40
Use formula for sum
a +5d = -11
Solving, -3d = -12
d = -4
So a = 9
Sum = 40
Use formula for sum
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