What is the sum of all even number between 5 and 21
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6+8+10+12+14+16+18+20
104 is the ans
Answered by
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Even numbers between 5 and 21
6 8 10 12 14 16 18 20
Sum = n/2 { 2a + (n-1)d}
= 8/2 { 2× 6 + (8-1)2}
= 4 {12 + 14}
= 4 × 26
= 104
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