5,10,15 is an arithmetic progression find the sum of first 21 digits
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The sum of the first 21 terms of the AP is 1155.
Step-by-step explanation:
The sum of first n terms of an AP is:
Here,
a = 5
d = 5
n = 21
Compute the sum of first 21 terms of an AP as follows:
Thus, the sum of the first 21 terms of the AP is 1155.
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