find the sum of the Ap:2+4+6+___________+56
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Here,
- a ( first term of the AP) = 2
- d ( common difference) = 2
- l ( the last term ) = 56
Let the number of terms be n .
So,
l = a + ( n-1 ) d
→ 56 = 2 + ( n-1) 2
→ 54 = (n-1)2
→ n-1 = 54/2
→ n - 1 = 27
→ n = 27 + 1
→ n = 28
Now,
the sum of the Ap: 2+4+6+_____+56
_________________________
Formula required—
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