find the sum of first 84 even numbers.
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Answer:
7140 is the sum of first 84 even numbers.
Step-by-step explanation:
Arithmetic Progression,
Sum = n/2 x (a + Tn)
= 84/2 x (2 + 168)
= (84 x 170)/ 2
= 14280/2
2 + 4 + 6 + 8 + 10 + 12 + . . . . + 168 = 7140
Therefore, 7140 is the sum of first 84 even numbers.
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Refer The attachment ⬆
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Hence , the sum of first 84 even numbers is 7140
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