Question

find the sum of 20 positive integers which are divisible by 4.answer in step by step​

Answer 1

step 1 Address the formula, input parameters & values.Input parameters & values:The number series 4, 8, 12, 16, 20, 24, 28, 32, .  .  .  .  , 80.The first term a = 4The common difference d = 4Total number of terms n = 20

step 2 apply the input parameter values in the AP formulaSum = n/2 x (a + Tn)= 20/2 x (4 + 80)= (20 x 84)/ 2= 1680/24 + 8 + 12 + 16 + 20 + 24 + 28 + 32 + .  .  .  .   + 80 = 840

Therefore, 840 is the sum of first 20 positive integers which are divisible by 4.

Answer 2

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• find the sum of 20 positive integers which are divisible by 4.

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Step 1

• Address the formula, input parameters & values.
• Input parameters & values:
• The number series 4, 8, 12, 16, 20, 24, 28, 32, . . . . , 80.
• The first term a = 4
• The common difference d = 4
• Total number of terms n = 20

Step 2

• apply the input parameter values in the AP formula
• Sum = n/2 x (a + Tn)
• = 20/2 x (4 + 80)
• = (20 x 84)/ 2
• = 1680/2
• 4 + 8 + 12 + 16 + 20 + 24 + 28 + 32 + . . . . + 80 = 840

Therefore, 840 is the sum of first 20 positive integers which are divisible by 4.