Question

find the sum 10+10²+10³+...+20 terms of the sequence are in GP​

Answer 1

Explanation:

Step 1: 3[1+11+111+1111+11111]

Instead of adding the numbers

Here's a quick method you can adopt.

Now, count the digits in the bracket i.e. one is 1 digit , 11 is 2 digit and the same for rest of the numbers.

Now you have to just put back in the bracket and multiply it with the common factor (here it is 3).

Step 2: 3[12345]

Step 3: Multiply 12345 by 3 and that's the answer

Answer 2

Answer:

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